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Toggle Button inside the usercontrol inside another usercontrol is not working

I am having two toggle buttons one in the outside usercontrol in the control template of the tabcontrol
Here is the code of the TabControl
<TabControl Name="ConnectionsTab" BorderThickness="0" Background="White">
<TabControl.Resources>
<Style TargetType="{x:Type TabControl}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type TabControl}">
<Grid x:Name="templateRoot" ClipToBounds="true" SnapsToDevicePixels="true" KeyboardNavigation.TabNavigation="Local">
<Grid.ColumnDefinitions>
<ColumnDefinition x:Name="ColumnDefinition0"/>
<ColumnDefinition x:Name="ColumnDefinition1" Width="0"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition x:Name="RowDefinition0" Height="Auto"/>
<RowDefinition x:Name="RowDefinition1" Height="*"/>
</Grid.RowDefinitions>
<WrapPanel Grid.Column="0">
<Grid HorizontalAlignment="Stretch">
<Grid.ColumnDefinitions>
<ColumnDefinition></ColumnDefinition>
<ColumnDefinition Width="30"></ColumnDefinition>
</Grid.ColumnDefinitions>
<ScrollViewer HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Disabled" materialDesign:ButtonAssist.CornerRadius="10">
<TabPanel x:Name="headerPanel" Background="Transparent" IsItemsHost="true" Margin="2,2,2,0" Grid.Row="0" KeyboardNavigation.TabIndex="1" Panel.ZIndex="1" Grid.Column="0"/>
</ScrollViewer>
<Border Height="30" VerticalAlignment="Stretch" BorderBrush="LightGray" BorderThickness="0" Grid.Column="1">
<Grid Margin="0,0,0,0">
<ToggleButton Name="OpenPopupButtonConnectionList" Background="White" BorderBrush="Transparent" VerticalAlignment="Bottom" Height="30" ClickMode="Hover">
<ToggleButton.Style>
<Style TargetType="{x:Type ToggleButton}">
<Setter Property="BorderThickness" Value="0"/>
</Style>
</ToggleButton.Style>
<Grid Margin="0,10,0,0">
<materialDesign:PackIcon Background="White" Foreground="Black" Kind="ArrowDropDown" Height="18" VerticalAlignment="Bottom" Width="18" />
</Grid>
</ToggleButton>
<Popup Name="PresetPopupConnectionList" IsOpen="{Binding ElementName=OpenPopupButtonConnectionList, Path=IsChecked}" PlacementTarget="{Binding ElementName=OpenPopupButtonConnectionList}" AllowsTransparency="True" PopupAnimation="Slide" StaysOpen="False" >
<ListBox Name="ConnectionList" ItemsSource="{Binding Items, RelativeSource={RelativeSource Mode=TemplatedParent}}" Background="White" SelectionChanged="ConnectionList_SelectionChanged" MaxHeight="300" BorderBrush="LightGray" BorderThickness="1" SelectionMode="Single" SelectedIndex="-1">
<ListBox.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding Header}"></TextBlock>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</Popup>
</Grid>
</Border>
</Grid>
</WrapPanel>
<Border x:Name="contentPanel" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Grid.Column="0" KeyboardNavigation.DirectionalNavigation="Contained" Grid.Row="1" KeyboardNavigation.TabIndex="2" KeyboardNavigation.TabNavigation="Local">
<ContentPresenter x:Name="PART_SelectedContentHost" ContentSource="SelectedContent" Margin="{TemplateBinding Padding}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
</Border>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="TabStripPlacement" Value="Bottom">
<Setter Property="Grid.Row" TargetName="headerPanel" Value="1"/>
<Setter Property="Grid.Row" TargetName="contentPanel" Value="0"/>
<Setter Property="Height" TargetName="RowDefinition0" Value="*"/>
<Setter Property="Height" TargetName="RowDefinition1" Value="Auto"/>
<Setter Property="Margin" TargetName="headerPanel" Value="2,0,2,2"/>
</Trigger>
<Trigger Property="TabStripPlacement" Value="Left">
<Setter Property="Grid.Row" TargetName="headerPanel" Value="0"/>
<Setter Property="Grid.Row" TargetName="contentPanel" Value="0"/>
<Setter Property="Grid.Column" TargetName="headerPanel" Value="0"/>
<Setter Property="Grid.Column" TargetName="contentPanel" Value="1"/>
<Setter Property="Width" TargetName="ColumnDefinition0" Value="Auto"/>
<Setter Property="Width" TargetName="ColumnDefinition1" Value="*"/>
<Setter Property="Height" TargetName="RowDefinition0" Value="*"/>
<Setter Property="Height" TargetName="RowDefinition1" Value="0"/>
<Setter Property="Margin" TargetName="headerPanel" Value="2,2,0,2"/>
</Trigger>
<Trigger Property="TabStripPlacement" Value="Right">
<Setter Property="Grid.Row" TargetName="headerPanel" Value="0"/>
<Setter Property="Grid.Row" TargetName="contentPanel" Value="0"/>
<Setter Property="Grid.Column" TargetName="headerPanel" Value="1"/>
<Setter Property="Grid.Column" TargetName="contentPanel" Value="0"/>
<Setter Property="Width" TargetName="ColumnDefinition0" Value="*"/>
<Setter Property="Width" TargetName="ColumnDefinition1" Value="Auto"/>
<Setter Property="Height" TargetName="RowDefinition0" Value="*"/>
<Setter Property="Height" TargetName="RowDefinition1" Value="0"/>
<Setter Property="Margin" TargetName="headerPanel" Value="0,2,2,2"/>
</Trigger>
<Trigger Property="IsEnabled" Value="false">
<Setter Property="TextElement.Foreground" TargetName="templateRoot" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<Style TargetType="{x:Type TabItem}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type TabItem}">
<Grid Background="White">
<Border Name="Border" BorderBrush="#1b9ed2" Margin="6,0,12,0" Background="White">
<ContentPresenter Height="30" x:Name="ContentSite" ContentSource="Header" VerticalAlignment="Bottom" HorizontalAlignment="Center" Margin="5,15,5,-5">
</ContentPresenter>
</Border>
<Button Background="Transparent" BorderBrush="Transparent" Name="TabCloseButton" Click="TabCloseButton_Click" HorizontalAlignment="Right" VerticalAlignment="Bottom" ToolTip="Close" HorizontalContentAlignment="Right" Padding="0">
<materialDesign:PackIcon Kind="Close" Foreground="Gray" HorizontalAlignment="Right"/>
</Button>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="TabIndex" Value="0">
<Setter TargetName="TabCloseButton" Property="Visibility" Value="Collapsed"/>
</Trigger>
<Trigger Property="IsSelected" Value="True">
<Setter Property="FontWeight" Value="DemiBold" />
<Setter TargetName="Border" Property="BorderThickness" Value="0,0,0,2"/>
</Trigger>
<Trigger Property="IsSelected" Value="False">
<Setter TargetName="Border" Property="BorderThickness" Value="0,0,0,0"/>
</Trigger>
<Trigger Property="IsMouseOver" Value="true">
<Setter Property="FontWeight" Value="DemiBold" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
<Setter Property="FontSize" Value="12"/>
</Style>
</TabControl.Resources>
</TabControl>
I have added another usercontrol in the connectionspage as the first tabitem
public ConnectionsPage(PMPResponse response)
{
this.response = response;
InitializeComponent();
tabItems.Add(new TabItem { Header = "Connections", Content = new ResourceAccountDisplayUserControlCopy(response), TabIndex = 0 });
ConnectionsTab.ItemsSource = tabItems;
ConnectionsTab.SelectedIndex = 0;
LoadResourceUserControl();
}
I have another popup inside the inner usercontrol
<Grid>
<ToggleButton Name="OpenPopupButtonUserProfile" Background="Transparent" BorderBrush="Transparent" Height="20" VerticalAlignment="Center" Width="20">
<ToggleButton.Style>
<Style TargetType="{x:Type ToggleButton}">
<Setter Property="BorderThickness" Value="0"/>
</Style>
</ToggleButton.Style>
<materialDesign:PackIcon Background="White" Foreground="Black" Kind="ArrowDropDown" Height="18" VerticalAlignment="Center" Width="18" />
</ToggleButton>
<Popup Name="PresetPopupSort" IsOpen="{Binding ElementName=OpenPopupButtonUserProfile, Path=IsChecked}" PlacementTarget="{Binding ElementName=OpenPopupButtonUserProfile}" AllowsTransparency="True" PopupAnimation="Slide" StaysOpen="False" >
<ListBox Background="White" HorizontalContentAlignment="Center" BorderBrush="LightGray" BorderThickness="0.5" Margin="15,0,15,0" Padding="5">
<ListBox.Resources>
<Style TargetType="Border">
<Setter Property="CornerRadius" Value="10"/>
</Style>
<Style TargetType="ListBoxItem">
</Style>
</ListBox.Resources>
<ListBoxItem Height="25" Padding="5,0,5,0">
<Button Height="20" Padding="0" Name="SortAscending" Click="SortAscending_Click" Background="Transparent" BorderBrush="Transparent" Foreground="Gray">Ascending</Button>
</ListBoxItem>
<Separator Height="0.5" Margin="-8,2,-7.6,2"/>
<ListBoxItem Height="25" Padding="5,0,5,0">
<Button Height="20" Padding="0" Name="SortDescending" Click="SortDescending_Click" Background="Transparent" BorderBrush="Transparent" Foreground="Gray">Descending</Button>
</ListBoxItem>
</ListBox>
</Popup>
</Grid>
When I click the inner usercontrol's toggle button the popup appears, when I click the outer toggle button the popup appears.
But Once the outer toggle button is clicked. when the inner toggle button is clicked, The popup inside the inner usercontrol is not showing. but the inner toggle button returns true. The toggle button is getting checked when the outer toggle button is clicked both the popup shows simultaneously.
I don't know what I am doing wrong.

Why is my ScrollViewer's repeatbutton white at the bottom?

So I am curious to why the scrollviewers repeatbutton at the bottom is white, it should be transparent, I didnt notice this until I resized my scrollviewer to fit perfectly, how do I change it's color to transparent?
I was looking throught the
RepeatButton part of the style and tried changing the background property but that didn't work either, it did nothing.
I even tried hiding it like so
<RepeatButton x:Name="PageDown"
Command="ScrollBar.PageUpCommand"
Opacity="0"
Focusable="false"
Visibility="Hidden"/>
But that didnt work either, it was still there.
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Style x:Key="ScrollBarTrackThumb"
TargetType="{x:Type Thumb}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Thumb}">
<Grid x:Name="Grid">
<Rectangle HorizontalAlignment="Stretch"
VerticalAlignment="Stretch"
Width="Auto"
Height="Auto"
Fill="Transparent" />
<Border x:Name="CornerScrollBarRectangle"
CornerRadius="5"
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch"
Width="Auto"
Height="Auto"
Margin="0,1,0,1"
Background="{TemplateBinding Background}" />
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="Tag"
Value="Horizontal">
<Setter TargetName="CornerScrollBarRectangle"
Property="Width"
Value="Auto" />
<Setter Property="Background" Value="Transparent"/>
<Setter TargetName="CornerScrollBarRectangle"
Property="Height"
Value="6" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<Style TargetType="{x:Type ScrollBar}">
<Setter Property="Stylus.IsFlicksEnabled"
Value="false" />
<Setter Property="Foreground"
Value="#ADABAB" />
<Setter Property="Background"
Value="Transparent" />
<Setter Property="Width"
Value="7" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ScrollBar}">
<Grid x:Name="GridRoot"
Width="7"
Background="{TemplateBinding Background}">
<Grid.RowDefinitions>
<RowDefinition Height="0.00001*" />
</Grid.RowDefinitions>
<Track x:Name="PART_Track"
Grid.Row="0"
IsDirectionReversed="true"
Focusable="false">
<Track.Thumb>
<Thumb x:Name="Thumb"
Background="{TemplateBinding Foreground}"
Style="{DynamicResource ScrollBarTrackThumb}" />
</Track.Thumb>
<Track.IncreaseRepeatButton>
<RepeatButton x:Name="PageUp"
Command="ScrollBar.PageDownCommand"
Opacity="0"
Focusable="false"/>
</Track.IncreaseRepeatButton>
<Track.DecreaseRepeatButton>
<RepeatButton x:Name="PageDown"
Command="ScrollBar.PageUpCommand"
Opacity="0"
Focusable="false" />
</Track.DecreaseRepeatButton>
</Track>
</Grid>
<ControlTemplate.Triggers>
<Trigger SourceName="Thumb"
Property="IsMouseOver"
Value="true">
<Setter Value="{DynamicResource ButtonSelectBrush}"
TargetName="Thumb"
Property="Background" />
</Trigger>
<Trigger SourceName="Thumb"
Property="IsDragging"
Value="true">
<Setter Value="{DynamicResource DarkBrush}"
TargetName="Thumb"
Property="Background" />
</Trigger>
<Trigger Property="IsEnabled"
Value="false">
<Setter TargetName="Thumb"
Property="Visibility"
Value="Collapsed" />
</Trigger>
<Trigger Property="Orientation"
Value="Horizontal">
<Setter TargetName="GridRoot"
Property="LayoutTransform">
<Setter.Value>
<RotateTransform Angle="-90" />
</Setter.Value>
</Setter>
<Setter TargetName="PART_Track"
Property="LayoutTransform">
<Setter.Value>
<RotateTransform Angle="-90" />
</Setter.Value>
</Setter>
<Setter Property="Width"
Value="Auto" />
<Setter Property="Height"
Value="8" />
<Setter TargetName="Thumb"
Property="Tag"
Value="Horizontal" />
<Setter TargetName="PageDown"
Property="Command"
Value="ScrollBar.PageLeftCommand" />
<Setter TargetName="PageUp"
Property="Command"
Value="ScrollBar.PageRightCommand" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</ResourceDictionary>
And the actual scrollviewer
<ScrollViewer Height="380"
Margin="10">
<ListView ItemsSource="{Binding MessageViewModel.Messages}"
x:Name="MyListView"
Background="Transparent"
BorderThickness="0"
Height="380">
<ListView.ItemTemplate>
<DataTemplate>
<WrapPanel>
<TextBlock Text="{Binding Message}"
FontFamily="Consolas"
Foreground="#61d73d"
TextWrapping="Wrap"/>
</WrapPanel>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>

like Klaus, I think the issue is not with your repeatButton. Rather, you see the (white) background through your repeatButton.
try putting a red rectangle just behind your scrollButton to see the outcome
or even better : use snoop to check this kind of issue.
but also, Clemens is right : style/template the scrollviewer inside the listView, rather than outside.

Adjust dropdown arrow margin of WPF TreeView

I have a TreeView which simplified is defined as
<TreeView ItemsSource="{Binding TreeItems}">
<TreeView.Resources>
<DataTemplate DataType="{x:Type models:MyModel}">
<Border Margin="{Binding Margin}" >
<Grid>
<TextBlock Text="{Binding Path=Name}" Margin="3,3,3,3" />
</Grid>
</Border>
</DataTemplate>
</TreeView.Resources>
</TreeView>
It looks like this
As you can see due to the Margin, which is variable, there is space between the items. The problem is the dropdown arrow. It is not centered on the element. Well, it is centered on the element ignoring the margin. How do I adjust the arrow?

Your XAML markup is both incomplete and incorrect: the DataTemplate should be a HierarchicalDataTemplate and it should be placed in a <TreeView.ItemTemplate> tag. This doesn't apply after your edit.
You can apply the margin to the complete TreeViewItem content including the dropdown arrow:
<TreeView ItemsSource="{Binding Items}">
<TreeView.ItemContainerStyle>
<Style TargetType="TreeViewItem">
<Setter Property="Margin" Value="{Binding Margin}"/>
</Style>
</TreeView.ItemContainerStyle>
<TreeView.ItemTemplate>
<HierarchicalDataTemplate ItemsSource="{Binding SubItems}">
<Border>
<Grid>
<TextBlock Margin="3,3,3,3"/>
</Grid>
</Border>
</HierarchicalDataTemplate>
</TreeView.ItemTemplate>
</TreeView>

Yes, I know the style below is too lengthy, but give it a try.
Just put it in a separate resource dictionary and merge it.
<TreeView ItemsSource="{Binding TreeItems}" ItemContainerStyle="{StaticResource CenteredExpanderTreeViewItemStyle}">
<TreeView.Resources>
<DataTemplate DataType="{x:Type models:MyModel}">
<Border Margin="{Binding Margin}" >
<Grid>
<TextBlock Text="{Binding Path=Name}" Margin="3,3,3,3" />
</Grid>
</Border>
</DataTemplate>
</TreeView.Resources>
</TreeView>
CenteredExpanderTreeViewItemStyle.xaml
<Style x:Key="TreeViewItemFocusVisual">
<Setter Property="Control.Template">
<Setter.Value>
<ControlTemplate>
<Rectangle/>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<SolidColorBrush x:Key="TreeViewItem.TreeArrow.Static.Checked.Fill" Color="#FF595959"/>
<SolidColorBrush x:Key="TreeViewItem.TreeArrow.Static.Checked.Stroke" Color="#FF262626"/>
<SolidColorBrush x:Key="TreeViewItem.TreeArrow.MouseOver.Stroke" Color="#FF27C7F7"/>
<SolidColorBrush x:Key="TreeViewItem.TreeArrow.MouseOver.Fill" Color="#FFCCEEFB"/>
<SolidColorBrush x:Key="TreeViewItem.TreeArrow.MouseOver.Checked.Stroke" Color="#FF1CC4F7"/>
<SolidColorBrush x:Key="TreeViewItem.TreeArrow.MouseOver.Checked.Fill" Color="#FF82DFFB"/>
<PathGeometry x:Key="TreeArrow" Figures="M0,0 L0,6 L6,0 z"/>
<SolidColorBrush x:Key="TreeViewItem.TreeArrow.Static.Fill" Color="#FFFFFFFF"/>
<SolidColorBrush x:Key="TreeViewItem.TreeArrow.Static.Stroke" Color="#FF818181"/>
<Style x:Key="ExpandCollapseToggleStyle" TargetType="{x:Type ToggleButton}">
<Setter Property="Focusable" Value="False"/>
<Setter Property="Width" Value="16"/>
<Setter Property="Height" Value="16"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ToggleButton}">
<Border Background="Transparent" Height="16" Padding="5,5,5,5" Width="16">
<Path x:Name="ExpandPath" Data="{StaticResource TreeArrow}" Fill="{StaticResource TreeViewItem.TreeArrow.Static.Fill}" Stroke="{StaticResource TreeViewItem.TreeArrow.Static.Stroke}">
<Path.RenderTransform>
<RotateTransform Angle="135" CenterY="3" CenterX="3"/>
</Path.RenderTransform>
</Path>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsChecked" Value="True">
<Setter Property="RenderTransform" TargetName="ExpandPath">
<Setter.Value>
<RotateTransform Angle="180" CenterY="3" CenterX="3"/>
</Setter.Value>
</Setter>
<Setter Property="Fill" TargetName="ExpandPath" Value="{StaticResource TreeViewItem.TreeArrow.Static.Checked.Fill}"/>
<Setter Property="Stroke" TargetName="ExpandPath" Value="{StaticResource TreeViewItem.TreeArrow.Static.Checked.Stroke}"/>
</Trigger>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Stroke" TargetName="ExpandPath" Value="{StaticResource TreeViewItem.TreeArrow.MouseOver.Stroke}"/>
<Setter Property="Fill" TargetName="ExpandPath" Value="{StaticResource TreeViewItem.TreeArrow.MouseOver.Fill}"/>
</Trigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsMouseOver" Value="True"/>
<Condition Property="IsChecked" Value="True"/>
</MultiTrigger.Conditions>
<Setter Property="Stroke" TargetName="ExpandPath" Value="{StaticResource TreeViewItem.TreeArrow.MouseOver.Checked.Stroke}"/>
<Setter Property="Fill" TargetName="ExpandPath" Value="{StaticResource TreeViewItem.TreeArrow.MouseOver.Checked.Fill}"/>
</MultiTrigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<Style x:Key="CenteredExpanderTreeViewItemStyle" TargetType="{x:Type TreeViewItem}">
<Setter Property="Background" Value="Transparent"/>
<Setter Property="HorizontalContentAlignment" Value="{Binding HorizontalContentAlignment, RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}"/>
<Setter Property="VerticalContentAlignment" Value="{Binding VerticalContentAlignment, RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}"/>
<Setter Property="Padding" Value="1,0,0,0"/>
<Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
<Setter Property="FocusVisualStyle" Value="{StaticResource TreeViewItemFocusVisual}"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type TreeViewItem}">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition MinWidth="19" Width="Auto"/>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition/>
</Grid.RowDefinitions>
<ToggleButton x:Name="Expander" VerticalAlignment="Center" ClickMode="Press" IsChecked="{Binding IsExpanded, RelativeSource={RelativeSource TemplatedParent}}" Style="{StaticResource ExpandCollapseToggleStyle}"/>
<Border x:Name="Bd" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Grid.Column="1" Padding="{TemplateBinding Padding}" SnapsToDevicePixels="true">
<ContentPresenter x:Name="PART_Header" ContentSource="Header" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
</Border>
<ItemsPresenter x:Name="ItemsHost" Grid.ColumnSpan="2" Grid.Column="1" Grid.Row="1"/>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsExpanded" Value="false">
<Setter Property="Visibility" TargetName="ItemsHost" Value="Collapsed"/>
</Trigger>
<Trigger Property="HasItems" Value="false">
<Setter Property="Visibility" TargetName="Expander" Value="Hidden"/>
</Trigger>
<Trigger Property="IsSelected" Value="true">
<Setter Property="Background" TargetName="Bd" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/>
<Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.HighlightTextBrushKey}}"/>
</Trigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsSelected" Value="true"/>
<Condition Property="IsSelectionActive" Value="false"/>
</MultiTrigger.Conditions>
<Setter Property="Background" TargetName="Bd" Value="{DynamicResource {x:Static SystemColors.InactiveSelectionHighlightBrushKey}}"/>
<Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.InactiveSelectionHighlightTextBrushKey}}"/>
</MultiTrigger>
<Trigger Property="IsEnabled" Value="false">
<Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
<Style.Triggers>
<Trigger Property="VirtualizingPanel.IsVirtualizing" Value="true">
<Setter Property="ItemsPanel">
<Setter.Value>
<ItemsPanelTemplate>
<VirtualizingStackPanel/>
</ItemsPanelTemplate>
</Setter.Value>
</Setter>
</Trigger>
</Style.Triggers>
</Style>

Use given style for TreeViewItem like give below
<Style TargetType="TreeViewItem" BasedOn="{StaticResource {x:Type TreeViewItem}}">
<Setter Property="Margin" Value="3,3,3,3"></Setter>
</Style>
Hope this help.

To add a margin to the ToggleButton in a TreeView, you have to add a custom ControlTemplate. There are several good tutorials on MSDN, for example here: https://msdn.microsoft.com/de-de/library/ms788727(v=vs.85).aspx
I stripped one example down to the necessary elements to match your requirements. Please note, that the ToggleButton is this example is not styled at all, so it appears a normal Button would do. But I am sure, you find several good examples on how to style this Button in a way that suites you the best.
The code:
<Window.Resources>
<Style x:Key="TreeViewItemStyle" TargetType="{x:Type TreeViewItem}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type TreeViewItem}">
<Grid Margin="{Binding Margin}">
<Grid.ColumnDefinitions>
<ColumnDefinition MinWidth="20" Width="Auto"/>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"></RowDefinition>
</Grid.RowDefinitions>
<ToggleButton Grid.Column="0" x:Name="Expander" ClickMode="Press" IsChecked="{Binding IsExpanded, RelativeSource={RelativeSource TemplatedParent}}" />
<Border x:Name="Bd" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Grid.Row="0" Grid.Column="1" Padding="{TemplateBinding Padding}" SnapsToDevicePixels="true">
<ContentPresenter x:Name="PART_Header" ContentSource="Header" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
</Border>
<ItemsPresenter x:Name="ItemsHost" Grid.ColumnSpan="2" Grid.Column="1" Grid.Row="1" Margin="-10,0,0,0"/>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsExpanded" Value="false">
<Setter Property="Visibility" TargetName="ItemsHost" Value="Collapsed"/>
</Trigger>
<Trigger Property="HasItems" Value="false">
<Setter Property="Visibility" TargetName="Expander" Value="Hidden"/>
</Trigger>
<Trigger Property="IsSelected" Value="true">
<Setter Property="Background" TargetName="Bd" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/>
<Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.HighlightTextBrushKey}}"/>
</Trigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsSelected" Value="true"/>
<Condition Property="IsSelectionActive" Value="false"/>
</MultiTrigger.Conditions>
<Setter Property="Background" TargetName="Bd" Value="{DynamicResource {x:Static SystemColors.ControlBrushKey}}"/>
<Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
</MultiTrigger>
<Trigger Property="IsEnabled" Value="false">
<Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
<Style.Triggers>
<Trigger Property="VirtualizingStackPanel.IsVirtualizing" Value="true">
<Setter Property="ItemsPanel">
<Setter.Value>
<ItemsPanelTemplate>
<VirtualizingStackPanel/>
</ItemsPanelTemplate>
</Setter.Value>
</Setter>
</Trigger>
</Style.Triggers>
</Style>
</Window.Resources>
<TreeView ItemsSource="{Binding TreeItems}" ItemContainerStyle="{StaticResource TreeViewItemStyle}">
<TreeView.Resources>
<HierarchicalDataTemplate DataType="{x:Type library:MyModel}" ItemsSource="{Binding Children}" >
<TextBlock Text="{Binding Name}"></TextBlock>
</HierarchicalDataTemplate>
</TreeView.Resources>
</TreeView>

You should be able to do just this:
<Style TargetType="{x:Type TreeViewItem}" BasedOn="{StaticResource {x:Type TreeViewItem}}">
<Setter Property="Margin" Value="0,0,0,0" />
<!--Or edit Padding if Margin doesn't work-->
</Style>
It will use default style of a TreeViewItem and edit only defined properties. If you use explicitly defined style for TreeViewItem, use BaseOn="{StaticResource [YourStyleKey]}" (without [ ]).
If you need some more advanced styling I'd suggest you to use Blend to get the ControlTemplate of a TreeViewItem, then just edit it to your needs, without changing too much (keep in mind that names of controls used as a template may have a crucial meaning, so be careful what you are editing).
If you don't know how to use Blend to get your control's template, here is a simple tutorial described in a documentation of Telerik controls (don't worry, it works the same for all controls). You just need to create copy of a TreeViewItem ControlTemplate, paste it to your application and you are good to go (editing).
By using Blend you can get templates of all building blocks of a TreeView control and make them look like you want them to. You just need to do some digging.

How to change width for a scroll bar in WPF?

In my WPF application I need to change the width size for a SurfaceScrollViewer. At the moment I am using this code with no success.
Any idea how to sole this?
<Window.Resources>
<Style TargetType="ScrollBar">
<Setter Property="Width" Value="25"/>
</Style>
</Window.Resources>

What you need to do is create a style based on the SurfaceListBox (or whatever element you are using to hold your scrollable items).
This will generate a (very verbose unfortunately) complete listing of elements, including the SurfaceScrollViewer and its associated properties. In here you can find the scrollbar element and change it.
If you're not sure what I mean, have a look into a tutorial on restyling WPF checkboxes as it should give you some context.
I've attached a sample layout below:
<UserControl.Resources>
<!-- Base Grid style for 55 dpi -->
<Style TargetType="{x:Type Control}" x:Key="ControlBaseStyle">
<Setter Property="FocusVisualStyle"
Value="{x:Null}"/>
<Setter Property="SnapsToDevicePixels"
Value="False"/>
<Setter Property="FontFamily"
Value="Segoe360"/>
<Setter Property="FontWeight"
Value="Normal"/>
<Setter Property="FontSize"
Value="17"/>
<Setter Property="Padding"
Value="6,2,10,10"/>
<Setter Property="MinHeight"
Value="38"/>
<Setter Property="MinWidth"
Value="38"/>
<Setter Property="Margin"
Value="1"/>
<Setter Property="HorizontalContentAlignment"
Value="Left"/>
<Setter Property="VerticalContentAlignment"
Value="Top"/>
<Setter Property="BorderThickness"
Value="2"/>
</Style>
<!-- public section -->
<SolidColorBrush x:Key="ControlHitAreaBrush"
Color="#00FFFFFF"/>
<Style x:Key="UnstyledContainer" TargetType="{x:Type controls:SurfaceListBoxItem}" BasedOn="{StaticResource ControlBaseStyle}">
<Setter Property="Foreground" Value="{DynamicResource {x:Static controls:SurfaceColors.ListBoxItemForegroundBrushKey}}"/>
<Setter Property="BorderThickness" Value="0"/>
<Setter Property="HorizontalContentAlignment" Value="{Binding HorizontalContentAlignment, RelativeSource={RelativeSource FindAncestor, AncestorLevel=1, AncestorType={x:Type ItemsControl}}}" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type controls:SurfaceListBoxItem}">
<Grid x:Name="Grid" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" Margin="10,0">
<Border x:Name="ButtonBody"
BorderThickness="{TemplateBinding BorderThickness}"
BorderBrush="{TemplateBinding BorderBrush}"
SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
<Border x:Name="PressOverlay"
Opacity="0"
SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
<ContentPresenter x:Name="Content"
Margin="{TemplateBinding Padding}"
HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<!-- Minimum HitArea Base Style for 55 dpi-->
<Style x:Key="SurfaceHitAreaBaseStyle"
TargetType="{x:Type Control}">
<Setter Property="SnapsToDevicePixels"
Value="False"/>
<Setter Property="Background"
Value="{StaticResource ControlHitAreaBrush}"/>
<Setter Property="IsTabStop"
Value="False"/>
<Setter Property="Focusable"
Value="False"/>
<Setter Property="FocusVisualStyle"
Value="{x:Null}"/>
<Setter Property="MinWidth"
Value="40" />
<Setter Property="MinHeight"
Value="40" />
</Style>
<Style x:Key="SurfaceVertScrollBarRepeatButton"
TargetType="{x:Type controls:SurfaceRepeatButton}" >
<Setter Property="Interval"
Value="150" />
<Setter Property="BorderBrush"
Value="{x:Null}" />
<Setter Property="Background"
Value="{StaticResource ControlHitAreaBrush}" />
<Setter Property="OverridesDefaultStyle" Value="true"/>
<Setter Property="Focusable" Value="false"/>
<Setter Property="IsTabStop" Value="false"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type controls:SurfaceRepeatButton}">
<Grid Width="40" Background="{TemplateBinding Background}">
<Rectangle HorizontalAlignment="Center"
x:Name="Line"
MinWidth="2"
Fill="{DynamicResource {x:Static controls:SurfaceColors.TrackBackgroundBrushKey}}"/>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsEnabled"
Value="False">
<Setter Property="Fill"
TargetName="Line"
Value="{DynamicResource {x:Static controls:SurfaceColors.ThumbDisabledBrushKey}}"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<!-- ScrollBar Vert Thumb -->
<Style x:Key="SurfaceScrollBarThumbStyle"
TargetType="{x:Type controls:SurfaceThumb}"
BasedOn="{StaticResource SurfaceHitAreaBaseStyle}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type controls:SurfaceThumb}">
<ControlTemplate.Resources>
<Storyboard x:Key="Touch">
<DoubleAnimation Duration="0:0:0.05"
Storyboard.TargetName="Thumb"
Storyboard.TargetProperty="Width"
To="16"/>
<ThicknessAnimation Duration="0:0:0.05"
Storyboard.TargetName="Thumb"
Storyboard.TargetProperty="Margin"
To="-1,0,-1,0" />
</Storyboard>
<Storyboard x:Key="Release">
<DoubleAnimation Duration="0:0:0.1"
Storyboard.TargetName="Thumb"
Storyboard.TargetProperty="Width"
To="14"/>
<ThicknessAnimation Duration="0:0:0.1"
Storyboard.TargetName="Thumb"
Storyboard.TargetProperty="Margin"
To="0,0,0,0" />
</Storyboard>
</ControlTemplate.Resources>
<Grid x:Name="Grid"
Background="{TemplateBinding Background}"
SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}">
<Rectangle x:Name="Thumb"
Height="Auto"
Width="14"
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch"
Fill="{DynamicResource {x:Static controls:SurfaceColors.ThumbEnabledBrushKey}}" />
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="controls:TouchExtensions.AreAnyInputDevicesCapturedWithin"
Value="True">
<Trigger.EnterActions>
<BeginStoryboard Storyboard="{StaticResource Touch}"/>
</Trigger.EnterActions>
<Trigger.ExitActions>
<BeginStoryboard Storyboard="{StaticResource Release}"/>
</Trigger.ExitActions>
</Trigger>
<Trigger Property="IsEnabled"
Value="False">
<Setter Property="Fill"
TargetName="Thumb"
Value="{DynamicResource {x:Static controls:SurfaceColors.ThumbDisabledBrushKey}}"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<!-- ScrollBar RepeatButton -->
<Style x:Key="SurfaceHorzScrollBarRepeatButton"
TargetType="{x:Type controls:SurfaceRepeatButton}" >
<Setter Property="Interval"
Value="150" />
<Setter Property="BorderBrush"
Value="{x:Null}" />
<Setter Property="Background"
Value="{StaticResource ControlHitAreaBrush}" />
<Setter Property="OverridesDefaultStyle" Value="true"/>
<Setter Property="Focusable" Value="false"/>
<Setter Property="IsTabStop" Value="false"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type controls:SurfaceRepeatButton}">
<Grid Height="40" Background="{TemplateBinding Background}">
<Rectangle VerticalAlignment="Center"
x:Name="Line"
MinHeight="2"
Fill="{DynamicResource {x:Static controls:SurfaceColors.TrackBackgroundBrushKey}}"/>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsEnabled"
Value="False">
<Setter Property="Fill"
TargetName="Line"
Value="{DynamicResource {x:Static controls:SurfaceColors.ThumbDisabledBrushKey}}"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<Style x:Key="SurfaceScrollBarHorizThumbStyle"
TargetType="{x:Type controls:SurfaceThumb}"
BasedOn="{StaticResource SurfaceHitAreaBaseStyle}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type controls:SurfaceThumb}">
<ControlTemplate.Resources>
<!-- Vertical orientation -->
<Storyboard x:Key="Touch">
<DoubleAnimation Duration="0:0:0.05"
Storyboard.TargetName="Thumb"
Storyboard.TargetProperty="Height"
To="16"/>
<ThicknessAnimation Duration="0:0:0.05"
Storyboard.TargetName="Thumb"
Storyboard.TargetProperty="Margin"
To="0,-1,0,-1" />
</Storyboard>
<Storyboard x:Key="Release">
<DoubleAnimation Duration="0:0:0.1"
Storyboard.TargetName="Thumb"
Storyboard.TargetProperty="Height"
To="14"/>
<ThicknessAnimation Duration="0:0:0.1"
Storyboard.TargetName="Thumb"
Storyboard.TargetProperty="Margin"
To="0,0,0,0" />
</Storyboard>
</ControlTemplate.Resources>
<Grid x:Name="Grid"
Background="{TemplateBinding Background}"
SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" >
<Rectangle x:Name="Thumb"
Width="Auto"
Height="14"
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch"
Fill="{DynamicResource {x:Static controls:SurfaceColors.ThumbEnabledBrushKey}}" />
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="controls:TouchExtensions.AreAnyInputDevicesCapturedWithin"
Value="True">
<Trigger.EnterActions>
<BeginStoryboard Storyboard="{StaticResource Touch}"/>
</Trigger.EnterActions>
<Trigger.ExitActions>
<BeginStoryboard Storyboard="{StaticResource Release}"/>
</Trigger.ExitActions>
</Trigger>
<Trigger Property="IsEnabled"
Value="False">
<Setter Property="Fill"
TargetName="Thumb"
Value="{DynamicResource {x:Static controls:SurfaceColors.ThumbDisabledBrushKey}}"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<!-- ScrollBar -->
<Style x:Key="SurfaceScrollBarStyle"
TargetType="{x:Type controls:SurfaceScrollBar}"
>
<Style.Resources>
<System:Double x:Key="{x:Static SystemParameters.VerticalScrollBarButtonHeightKey}">38</System:Double>
<System:Double x:Key="{x:Static SystemParameters.HorizontalScrollBarButtonWidthKey}">38</System:Double>
</Style.Resources>
<Setter Property="Stylus.IsPressAndHoldEnabled"
Value="False"/>
<Setter Property="Stylus.IsFlicksEnabled"
Value="False"/>
<Setter Property="Width"
Value="38"/>
<Setter Property="Height"
Value="Auto"/>
<Setter Property="Template">
<Setter.Value>
<!-- vertical scroll bar -->
<ControlTemplate TargetType="{x:Type controls:SurfaceScrollBar}">
<Grid x:Name="GridRoot" Background="{TemplateBinding Background}">
<Border x:Name="Track"
VerticalAlignment="Stretch"
HorizontalAlignment="Stretch">
<Track x:Name="PART_Track"
IsDirectionReversed="True">
<Track.IncreaseRepeatButton>
<controls:SurfaceRepeatButton x:Name="IncreaseRepeat"
Background="{TemplateBinding Background}"
HorizontalAlignment="Center"
Style="{StaticResource SurfaceVertScrollBarRepeatButton}"
Command="ScrollBar.PageDownCommand"/>
</Track.IncreaseRepeatButton>
<Track.DecreaseRepeatButton>
<controls:SurfaceRepeatButton x:Name="DecreaseRepeat"
Background="{TemplateBinding Background}"
HorizontalAlignment="Center"
Style="{StaticResource SurfaceVertScrollBarRepeatButton}"
Command="ScrollBar.PageUpCommand"/>
</Track.DecreaseRepeatButton>
<Track.Thumb>
<controls:SurfaceThumb Style="{StaticResource SurfaceScrollBarThumbStyle}"
Background="{TemplateBinding Background}"
HorizontalAlignment="Center"
x:Name="Thumb"/>
</Track.Thumb>
</Track>
</Border>
</Grid>
<ControlTemplate.Triggers>
<!-- Animates Scrollbar from small to large state -->
<Trigger Property="IsEnabled"
Value="False">
<Setter Property="IsEnabled"
TargetName="PART_Track"
Value="False"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
<Style.BasedOn>
<StaticResource ResourceKey="SurfaceHitAreaBaseStyle"/>
</Style.BasedOn>
<Style.Triggers>
<!-- Horizontal orientation -->
<Trigger Property="Orientation" Value="Horizontal">
<Setter Property="Width"
Value="Auto"/>
<Setter Property="Height"
Value="38"/>
<!-- change the whole template -->
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type controls:SurfaceScrollBar}">
<Grid x:Name="GridRoot" Background="{TemplateBinding Background}">
<Border x:Name="Track"
VerticalAlignment="Stretch"
HorizontalAlignment="Stretch">
<Track x:Name="PART_Track">
<Track.DecreaseRepeatButton>
<controls:SurfaceRepeatButton x:Name="DecreaseRepeat"
Background="{TemplateBinding Background}"
VerticalAlignment="Center"
Style="{StaticResource SurfaceHorzScrollBarRepeatButton}"
Command="ScrollBar.PageLeftCommand" />
</Track.DecreaseRepeatButton>
<Track.IncreaseRepeatButton>
<controls:SurfaceRepeatButton x:Name="IncreaseRepeat"
Background="{TemplateBinding Background}"
VerticalAlignment="Center"
Style="{StaticResource SurfaceHorzScrollBarRepeatButton}"
Command="ScrollBar.PageRightCommand"/>
</Track.IncreaseRepeatButton>
<Track.Thumb>
<controls:SurfaceThumb Style="{StaticResource SurfaceScrollBarHorizThumbStyle}"
Background="{TemplateBinding Background}"
VerticalAlignment="Center"
x:Name="Thumb"/>
</Track.Thumb>
</Track>
</Border>
</Grid>
<ControlTemplate.Triggers>
<!-- Animates Scrollbar from small to large state -->
<Trigger Property="IsEnabled"
Value="False">
<Setter Property="Opacity"
TargetName="IncreaseRepeat"
Value="0.33"/>
<Setter Property="Opacity"
TargetName="DecreaseRepeat"
Value="0.33"/>
<Setter Property="IsEnabled"
TargetName="PART_Track"
Value="False"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Trigger>
</Style.Triggers>
</Style>
<!-- ScrollViewerBase -->
<Style x:Key="SurfaceScrollViewerStyle"
TargetType="{x:Type controls:SurfaceScrollViewer}">
<Setter Property="Elasticity"
Value="0.4,0.4" />
<Setter Property="ScrollViewer.HorizontalScrollBarVisibility"
Value="Auto" />
<Setter Property="ScrollViewer.VerticalScrollBarVisibility"
Value="Auto" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type controls:SurfaceScrollViewer}">
<Grid Background="{TemplateBinding Background}"
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="*" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Border x:Name="PART_ElasticBorder"
Background="{TemplateBinding Background}">
<ScrollContentPresenter
Margin="-1,-1,-1,-1"
Grid.Column="0"
Grid.ColumnSpan="1"
Grid.Row="0"
Grid.RowSpan="1"
Content="{TemplateBinding Content}"
ContentTemplate="{TemplateBinding ContentTemplate}"
CanContentScroll="{TemplateBinding CanContentScroll}"
CanHorizontallyScroll="False"
CanVerticallyScroll="False"
ScrollViewer.HorizontalScrollBarVisibility="Disabled" />
</Border>
<controls:SurfaceScrollBar Visibility="{TemplateBinding ComputedHorizontalScrollBarVisibility}"
x:Name="PART_HorizontalScrollBar"
Grid.Column="0"
Grid.Row="1"
Orientation="Horizontal"
Maximum="{TemplateBinding ScrollableWidth}"
Minimum="0"
Value="{Binding HorizontalOffset, Mode=OneWay, RelativeSource={RelativeSource TemplatedParent}}"
AutomationProperties.AutomationId="HorizontalScrollBar"
Height="Auto"
Style="{StaticResource SurfaceScrollBarStyle}"
LargeChange="1"
ViewportSize="{TemplateBinding ViewportWidth}"
ScrollViewer.HorizontalScrollBarVisibility="Disabled"
HorizontalContentAlignment="Stretch"
VerticalContentAlignment="Stretch"
HorizontalAlignment="Stretch"
Foreground="{x:Null}"/>
<controls:SurfaceScrollBar Visibility="{TemplateBinding ComputedVerticalScrollBarVisibility}"
x:Name="PART_VerticalScrollBar"
Grid.Column="1"
Grid.Row="0"
Orientation="Vertical"
Maximum="{TemplateBinding ScrollableHeight}"
Minimum="0"
Value="{Binding VerticalOffset, Mode=OneWay, RelativeSource={RelativeSource TemplatedParent}}"
AutomationProperties.AutomationId="VerticalScrollBar"
Width="Auto"
Style="{StaticResource SurfaceScrollBarStyle}"
LargeChange="1"
ViewportSize="{TemplateBinding ViewportHeight}"
ScrollViewer.HorizontalScrollBarVisibility="Disabled"
HorizontalContentAlignment="Stretch"
VerticalContentAlignment="Stretch"
HorizontalAlignment="Stretch"
Foreground="{x:Null}"
IsEnabled="True"/>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsEnabled"
Value="False">
<Setter Property="IsEnabled"
TargetName="PART_HorizontalScrollBar"
Value="False" />
<Setter Property="IsEnabled"
TargetName="PART_VerticalScrollBar"
Value="False" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<!-- Listbox ScrollView -->
<Style x:Key="SurfaceListBoxScrollViewerStyle"
TargetType="{x:Type controls:SurfaceScrollViewer}"
BasedOn="{StaticResource SurfaceScrollViewerStyle}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type controls:SurfaceScrollViewer}">
<Grid
HorizontalAlignment="Stretch"
Margin="{TemplateBinding BorderThickness}"
VerticalAlignment="Stretch"
SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<Border x:Name="PART_ElasticBorder"
SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"
BorderBrush="Transparent"
>
<ScrollContentPresenter Margin="{TemplateBinding Padding}"
Content="{TemplateBinding Content}"
ContentTemplate="{TemplateBinding ContentTemplate}"
CanContentScroll="{TemplateBinding CanContentScroll}"
CanHorizontallyScroll="False"
CanVerticallyScroll="False"
Grid.ColumnSpan="1"
Grid.RowSpan="1"
SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
</Border>
<controls:SurfaceScrollBar Visibility="{TemplateBinding ComputedHorizontalScrollBarVisibility}"
x:Name="PART_HorizontalScrollBar"
Grid.Row="1"
Orientation="Horizontal"
ViewportSize="{TemplateBinding ViewportWidth}"
Maximum="{TemplateBinding ScrollableWidth}"
Minimum="0"
Background="{TemplateBinding Background}"
Value="{Binding HorizontalOffset, Mode=OneWay, RelativeSource={RelativeSource TemplatedParent}}"
AutomationProperties.AutomationId="HorizontalScrollBar"
Height="Auto"
Style="{StaticResource SurfaceScrollBarStyle}"
LargeChange="1"
ClipToBounds="True"
SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
<controls:SurfaceScrollBar Visibility="{TemplateBinding ComputedVerticalScrollBarVisibility}"
x:Name="PART_VerticalScrollBar"
Grid.Column="1"
Grid.Row="0"
Orientation="Vertical"
ViewportSize="{TemplateBinding ViewportHeight}"
Maximum="{TemplateBinding ScrollableHeight}"
Minimum="0"
Value="{Binding VerticalOffset, Mode=OneWay, RelativeSource={RelativeSource TemplatedParent}}"
AutomationProperties.AutomationId="VerticalScrollBar"
Width="Auto"
Style="{StaticResource SurfaceScrollBarStyle}"
LargeChange="1"
ClipToBounds="True"
SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
<Border x:Name="Container"
Grid.Column="1"
Grid.Row="1"
SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"
BorderBrush="Transparent"
/>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsEnabled"
Value="False">
<Setter Property="IsEnabled"
TargetName="PART_HorizontalScrollBar"
Value="False"/>
<Setter Property="IsEnabled"
TargetName="PART_VerticalScrollBar"
Value="False"/>
<Setter Property="BorderBrush"
TargetName="PART_ElasticBorder"
Value="{DynamicResource {x:Static controls:SurfaceColors.ControlBorderDisabledBrushKey}}"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<!-- ListBox -->
<Style x:Key="UnstyledList" TargetType="{x:Type controls:SurfaceListBox}"
BasedOn="{StaticResource ControlBaseStyle}">
<Setter Property="ScrollViewer.HorizontalScrollBarVisibility"
Value="Auto" />
<Setter Property="ScrollViewer.VerticalScrollBarVisibility"
Value="Auto" />
<Setter Property="ScrollViewer.CanContentScroll"
Value="False" />
<Setter Property="controls:SurfaceScrollViewer.Elasticity"
Value="0,0.4" />
<Setter Property="MinHeight"
Value="80" />
<Setter Property="Foreground"
Value="{DynamicResource {x:Static controls:SurfaceColors.ButtonForegroundBrushKey}}"/>
<Setter Property="BorderBrush"
Value="{DynamicResource {x:Static controls:SurfaceColors.ListBoxBorderBrushKey}}"/>
<Setter Property="Padding"
Value="0" />
<Setter Property="BorderThickness"
Value="2" />
<Setter Property="Margin"
Value="0" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type controls:SurfaceListBox}">
<Grid SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" >
<controls:SurfaceScrollViewer
Style="{StaticResource SurfaceListBoxScrollViewerStyle}"
HorizontalScrollBarVisibility="{TemplateBinding ScrollViewer.HorizontalScrollBarVisibility}"
VerticalScrollBarVisibility="{TemplateBinding ScrollViewer.VerticalScrollBarVisibility}"
Focusable="False"
Foreground="{TemplateBinding Foreground}"
Width="Auto"
Height="Auto"
MinHeight="{TemplateBinding MinHeight}"
MinWidth="{TemplateBinding MinWidth}"
x:Name="scrollViewer"
Elasticity="{TemplateBinding controls:SurfaceScrollViewer.Elasticity}">
<ItemsPresenter ClipToBounds="False"
MinHeight="{TemplateBinding MinHeight}"
MinWidth="{TemplateBinding MinWidth}"/>
</controls:SurfaceScrollViewer>
<Border x:Name="Border"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}" />
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsGrouping"
Value="True">
<Setter Property="ScrollViewer.CanContentScroll"
Value="False" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</UserControl.Resources>
<s:SurfaceListBox x:Name="someList" Background="{x:Null}" Foreground="{x:Null}" BorderBrush="{x:Null}" ItemContainerStyle="{DynamicResource UnstyledContainer}" Style="{DynamicResource UnstyledList}" />

custom combobox in wpf Application

Im new to WPF Application. I need to customize my combobox like this image.
I have tried this example
http://www.eidias.com/Blog/2012/2/20/customizing-wpf-combo-box-style
<Window x:Class="win.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Window1" Height="300" Width="300" Background="Red">
<Window.Resources>
<ControlTemplate x:Key="CustomToggleButton" TargetType="ToggleButton">
<Grid>
<Border Name="Border" />
<Border Name="SmallBorder" />
<Path Name="Arrow" />
</Grid>
</ControlTemplate>
<Style TargetType="{x:Type ComboBoxItem}">
<Setter Property="FrameworkElement.OverridesDefaultStyle" Value="True" />
<Setter Property="Control.Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ComboBoxItem}">
<Border>
<ContentPresenter />
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<Style TargetType="{x:Type ComboBox}">
<Setter Property="FrameworkElement.OverridesDefaultStyle" Value="True" />
<Setter Property="Control.Template">
<Setter.Value>
<ControlTemplate TargetType="ComboBox">
<Grid>
<ToggleButton Template="{StaticResource CustomToggleButton}" />
<ContentPresenter />
<TextBox />
<Popup>
<Grid>
<Border>
<ScrollViewer>
<ItemsPresenter />
</ScrollViewer>
</Border>
</Grid>
</Popup>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Window.Resources>
<Grid>
<ComboBox Grid.Column="1" Height="40" Width="200" >
<ComboBoxItem Name="item1">item1</ComboBoxItem>
<ComboBoxItem Name="item2">item2</ComboBoxItem>
<ComboBoxItem Name="item3">item3</ComboBoxItem>
</ComboBox>
</Grid>
</Window>
This output works like textbox.Please help me guys!

I also liked the format and decided to reproduce it. Please find the XAML below. Hope it helps someone...
<Window x:Class="ComboStyle.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Window.Resources>
<ControlTemplate x:Key="ComboBoxToggleButton" TargetType="{x:Type ToggleButton}">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition />
<ColumnDefinition Width="20" />
</Grid.ColumnDefinitions>
<Border
x:Name="Border"
Grid.ColumnSpan="2"
CornerRadius="0"
Background="#FF3F3F3F"
BorderBrush="#FF97A0A5"
BorderThickness="1" />
<Border
Grid.Column="0"
CornerRadius="0"
Margin="1"
Background="#FF3F3F3F"
BorderBrush="#FF97A0A5"
BorderThickness="0,0,1,0" />
<Path
x:Name="Arrow"
Grid.Column="1"
Fill="White"
HorizontalAlignment="Center"
VerticalAlignment="Center"
Data="M0,0 L0,2 L4,6 L8,2 L8,0 L4,4 z"
/>
</Grid>
<!--<ControlTemplate.Triggers>
<Trigger Property="ToggleButton.IsMouseOver" Value="true">
<Setter TargetName="Border" Property="Background" Value="#808080" />
</Trigger>
<Trigger Property="ToggleButton.IsChecked" Value="true">
<Setter TargetName="Border" Property="Background" Value="#E0E0E0" />
</Trigger>
<Trigger Property="IsEnabled" Value="False">
<Setter TargetName="Border" Property="Background" Value="#EEEEEE" />
<Setter TargetName="Border" Property="BorderBrush" Value="#AAAAAA" />
<Setter Property="Foreground" Value="#888888"/>
<Setter TargetName="Arrow" Property="Fill" Value="#888888" />
</Trigger>
</ControlTemplate.Triggers>-->
</ControlTemplate>
<ControlTemplate x:Key="ComboBoxTextBox" TargetType="{x:Type TextBox}">
<Border x:Name="PART_ContentHost" Focusable="False" Background="{TemplateBinding Background}" />
</ControlTemplate>
<Style x:Key="{x:Type ComboBox}" TargetType="{x:Type ComboBox}">
<Setter Property="SnapsToDevicePixels" Value="true"/>
<Setter Property="OverridesDefaultStyle" Value="true"/>
<Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Auto"/>
<Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto"/>
<Setter Property="ScrollViewer.CanContentScroll" Value="true"/>
<Setter Property="MinWidth" Value="120"/>
<Setter Property="MinHeight" Value="20"/>
<Setter Property="Foreground" Value="White"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ComboBox}">
<Grid>
<ToggleButton
Name="ToggleButton"
Template="{StaticResource ComboBoxToggleButton}"
Grid.Column="2"
Focusable="false"
IsChecked="{Binding Path=IsDropDownOpen,Mode=TwoWay,RelativeSource={RelativeSource TemplatedParent}}"
ClickMode="Press">
</ToggleButton>
<ContentPresenter Name="ContentSite" IsHitTestVisible="False" Content="{TemplateBinding SelectionBoxItem}"
ContentTemplate="{TemplateBinding SelectionBoxItemTemplate}"
ContentTemplateSelector="{TemplateBinding ItemTemplateSelector}"
Margin="3,3,23,3"
VerticalAlignment="Center"
HorizontalAlignment="Left" />
<TextBox x:Name="PART_EditableTextBox"
Style="{x:Null}"
Template="{StaticResource ComboBoxTextBox}"
HorizontalAlignment="Left"
VerticalAlignment="Center"
Margin="3,3,23,3"
Focusable="True"
Background="#FF3F3F3F"
Foreground="Green"
Visibility="Hidden"
IsReadOnly="{TemplateBinding IsReadOnly}"/>
<Popup
Name="Popup"
Placement="Bottom"
IsOpen="{TemplateBinding IsDropDownOpen}"
AllowsTransparency="True"
Focusable="False"
PopupAnimation="Slide">
<Grid Name="DropDown"
SnapsToDevicePixels="True"
MinWidth="{TemplateBinding ActualWidth}"
MaxHeight="{TemplateBinding MaxDropDownHeight}">
<Border
x:Name="DropDownBorder"
Background="#FF3F3F3F"
BorderThickness="1"
BorderBrush="#888888"/>
<ScrollViewer Margin="4,6,4,6" SnapsToDevicePixels="True">
<StackPanel IsItemsHost="True" KeyboardNavigation.DirectionalNavigation="Contained" />
</ScrollViewer>
</Grid>
</Popup>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="HasItems" Value="false">
<Setter TargetName="DropDownBorder" Property="MinHeight" Value="95"/>
</Trigger>
<Trigger Property="IsEnabled" Value="false">
<Setter Property="Foreground" Value="#888888"/>
</Trigger>
<Trigger Property="IsGrouping" Value="true">
<Setter Property="ScrollViewer.CanContentScroll" Value="false"/>
</Trigger>
<Trigger SourceName="Popup" Property="Popup.AllowsTransparency" Value="true">
<Setter TargetName="DropDownBorder" Property="CornerRadius" Value="0"/>
<Setter TargetName="DropDownBorder" Property="Margin" Value="0,2,0,0"/>
</Trigger>
<Trigger Property="IsEditable" Value="true">
<Setter Property="IsTabStop" Value="false"/>
<Setter TargetName="PART_EditableTextBox" Property="Visibility" Value="Visible"/>
<Setter TargetName="ContentSite" Property="Visibility" Value="Hidden"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
<Style.Triggers>
</Style.Triggers>
</Style>
<!-- SimpleStyles: ComboBoxItem -->
<Style x:Key="{x:Type ComboBoxItem}" TargetType="{x:Type ComboBoxItem}">
<Setter Property="SnapsToDevicePixels" Value="true"/>
<Setter Property="Foreground" Value="White"/>
<Setter Property="OverridesDefaultStyle" Value="true"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ComboBoxItem}">
<Border Name="Border"
Padding="2"
SnapsToDevicePixels="true">
<ContentPresenter />
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsHighlighted" Value="true">
<Setter TargetName="Border" Property="Background" Value="#FF4F4F4F"/>
</Trigger>
<Trigger Property="IsEnabled" Value="false">
<Setter Property="Foreground" Value="#888888"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Window.Resources>
<Grid>
<Border Padding="10" Background="#FF3F3F3F">
<ComboBox Grid.Column="1" Height="30" Width="250" >
<ComboBoxItem Name="Item1">Item1</ComboBoxItem>
<ComboBoxItem Name="Item2">Item2</ComboBoxItem>
<ComboBoxItem Name="Item3">Item3</ComboBoxItem>
<ComboBoxItem Name="Item4">Item4</ComboBoxItem>
<ComboBoxItem Name="Item5">Item5</ComboBoxItem>
<ComboBoxItem Name="Item6">Item6</ComboBoxItem>
</ComboBox>
</Border>
</Grid>

Check out this link:
http://www.eidias.com/Blog/2012/2/20/customizing-wpf-combo-box-style
This is a blog with example code on how to make a custom Combobox. The custom combobox he is making looks very much like the one you need. So I think this will be very useful to you.

Here is a complete style for WPF ComboBox. It is also easy to customize.
http://www.wpfhelper.com/index.php/styles-in-wpf/combobox/15-combobox-style-in-wpf
The codes are quite long so I will not post them all here. However, here is the base ComboBox style:
<Style TargetType="{x:Type ComboBox}">
<Setter Property="Foreground" Value="Gray" />
<Setter Property="BorderBrush" Value="Gray" />
<Setter Property="Background" Value="White" />
<Setter Property="SnapsToDevicePixels" Value="true"/>
<Setter Property="OverridesDefaultStyle" Value="true"/>
<Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Auto"/>
<Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto"/>
<Setter Property="ScrollViewer.CanContentScroll" Value="true"/>
<Setter Property="FontSize" Value="16" />
<Setter Property="FontWeight" Value="Bold" />
<Setter Property="MinWidth" Value="50"/>
<Setter Property="MinHeight" Value="32"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ComboBox">
<Grid>
<ToggleButton
Name="ToggleButton"
BorderBrush="{TemplateBinding BorderBrush}"
Background="{TemplateBinding Background}"
Foreground="{TemplateBinding Foreground}"
Style="{StaticResource ComboBoxToggleButton}"
Grid.Column="2"
Focusable="false"
IsChecked="{Binding Path=IsDropDownOpen,Mode=TwoWay,RelativeSource={RelativeSource TemplatedParent}}"
ClickMode="Press">
</ToggleButton>
<ContentPresenter
Name="ContentSite"
IsHitTestVisible="False"
Content="{TemplateBinding SelectionBoxItem}"
ContentTemplate="{TemplateBinding SelectionBoxItemTemplate}"
ContentTemplateSelector="{TemplateBinding ItemTemplateSelector}"
Margin="10,3,30,3"
VerticalAlignment="Center"
HorizontalAlignment="Center" />
<TextBox x:Name="PART_EditableTextBox"
Style="{x:Null}"
Template="{StaticResource ComboBoxTextBox}"
HorizontalAlignment="Center"
VerticalAlignment="Center"
Margin="3,3,23,3"
Focusable="True"
Visibility="Hidden"
IsReadOnly="{TemplateBinding IsReadOnly}"/>
<Popup
Name="Popup"
Placement="Bottom"
IsOpen="{TemplateBinding IsDropDownOpen}"
AllowsTransparency="True"
Focusable="False"
PopupAnimation="Slide">
<Grid
Name="DropDown"
SnapsToDevicePixels="True"
MinWidth="{TemplateBinding ActualWidth}"
MaxHeight="{TemplateBinding MaxDropDownHeight}">
<Border
x:Name="DropDownBorder"
Background="White"
BorderThickness="2"
BorderBrush="Gray"/>
<ScrollViewer Margin="4,6,4,6" SnapsToDevicePixels="True">
<StackPanel IsItemsHost="True" KeyboardNavigation.DirectionalNavigation="Contained" />
</ScrollViewer>
</Grid>
</Popup>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="HasItems" Value="false">
<Setter TargetName="DropDownBorder" Property="MinHeight" Value="95"/>
</Trigger>
<Trigger Property="IsGrouping" Value="true">
<Setter Property="ScrollViewer.CanContentScroll" Value="false"/>
</Trigger>
<Trigger SourceName="Popup" Property="Popup.AllowsTransparency" Value="true">
<Setter TargetName="DropDownBorder" Property="CornerRadius" Value="0"/>
<Setter TargetName="DropDownBorder" Property="Margin" Value="0,2,0,0"/>
</Trigger>
<Trigger Property="IsEditable" Value="true">
<Setter Property="IsTabStop" Value="false"/>
<Setter TargetName="PART_EditableTextBox" Property="Visibility" Value="Visible"/>
<Setter TargetName="ContentSite" Property="Visibility" Value="Hidden"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>