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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.

WPF Listbox. Style does not work correcty

I've a problem with a WPF ListBox ( See code bellow ). I'm trying to change the background and foreground for the listBox items when the mouse is over or when the item is selected but it doesn't work and I don't know why.
<ListBox x:Name="ListBoxSnapshots" ItemsSource="{Binding DevicesImageList}" SelectedIndex="{Binding WebcamSelected}" BorderThickness="0" SelectionMode="Single" HorizontalContentAlignment="Left" VerticalContentAlignment="Stretch" SelectionChanged="ListBoxSnapshots_SelectionChanged" ScrollViewer.VerticalScrollBarVisibility="Disabled" >
<ListBox.ItemContainerStyle>
<Style TargetType="{x:Type ListBoxItem}">
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Background" Value="#FFBCBCBC"/>
<Setter Property="Foreground" Value="Black"/>
</Trigger>
<Trigger Property="IsMouseOver" Value="False">
<Setter Property="Background" Value="#FFD3D3D3"/>
<Setter Property="Foreground" Value="Black"/>
</Trigger>
<Trigger Property="IsSelected" Value="True">
<Setter Property="Background" Value="#FFD3D3D3"/>
<Setter Property="Foreground" Value="Black"/>
</Trigger>
<Trigger Property="IsSelected" Value="false">
<Setter Property="Background" Value="White"/>
<Setter Property="Foreground" Value="Black"/>
</Trigger>
</Style.Triggers>
</Style>
</ListBox.ItemContainerStyle>
<ListBox.ItemTemplate>
<DataTemplate>
<Border BorderThickness="2" BorderBrush="DarkGray">
<StackPanel Orientation="Horizontal">
<Image Source="{Binding Path=theImage}" Stretch="Fill" VerticalAlignment="Stretch" HorizontalAlignment="Stretch" Width="142" Height="80"/>
<Canvas Width="142" Height="80" Margin="-142,0,0,0">
<Image Source="/MyApp;component/Images/snapshot-whitetriangle.png" Stretch="Fill" VerticalAlignment="Stretch" HorizontalAlignment="Stretch" />
<Label FontSize="8" Content="{Binding Path=theImageIndex}" Foreground="DarkGray" FontWeight="DemiBold" Canvas.Top="61" Canvas.Left="110" HorizontalAlignment="Center" VerticalAlignment="Top" Width="34" Height="24" VerticalContentAlignment="Top" HorizontalContentAlignment="Right" />
</Canvas>
</StackPanel>
</Border>
</DataTemplate>
</ListBox.ItemTemplate>
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<WrapPanel IsItemsHost="True" Orientation="Horizontal" />
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
My listBox looks like the following picture.
The border of the Item selected has not the color that I have applied using Style.
Thanks,

Well, unfortunately it's not so easy... You need to change default ControlTemplate of ListBoxItem. Basing on this answer I've tried to make it look as i thought you wanted it to look. The most important elements are in <Setter Property="Template"> setter.
<Style TargetType="{x:Type ListBoxItem}">
<Setter Property="SnapsToDevicePixels" Value="True" />
<Setter Property="Padding" Value="4,1" />
<Setter Property="HorizontalContentAlignment" Value="{Binding HorizontalContentAlignment,
RelativeSource={RelativeSource FindAncestor,
AncestorLevel=1,
AncestorType={x:Type ItemsControl}}}" />
<Setter Property="VerticalContentAlignment" Value="{Binding VerticalContentAlignment,
RelativeSource={RelativeSource FindAncestor,
AncestorLevel=1,
AncestorType={x:Type ItemsControl}}}" />
<Setter Property="Background"
Value="Transparent" />
<Setter Property="BorderBrush"
Value="Transparent" />
<Setter Property="BorderThickness"
Value="1" />
<Setter Property="FocusVisualStyle">
<Setter.Value>
<Style>
<Setter Property="Control.Template">
<Setter.Value>
<ControlTemplate>
<Rectangle Margin="2"
SnapsToDevicePixels="True"
Stroke="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"
StrokeDashArray="1 2"
StrokeThickness="1" />
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Setter.Value>
</Setter>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ListBoxItem}">
<Border x:Name="Bd"
Background="White"
BorderBrush="DarkGray"
BorderThickness="{TemplateBinding BorderThickness}"
Padding="{TemplateBinding Padding}"
SnapsToDevicePixels="True">
<ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
Content="{TemplateBinding Content}"
ContentStringFormat="{TemplateBinding ContentStringFormat}"
ContentTemplate="{TemplateBinding ContentTemplate}"
SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
</Border>
<ControlTemplate.Triggers>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsMouseOver"
Value="True" />
</MultiTrigger.Conditions>
<Setter TargetName="Bd"
Property="Background"
Value="#FFBCBCBC" />
</MultiTrigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="Selector.IsSelectionActive"
Value="False" />
<Condition Property="IsSelected"
Value="True" />
</MultiTrigger.Conditions>
<Setter TargetName="Bd"
Property="Background"
Value="#FFD3D3D3" />
</MultiTrigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="Selector.IsSelectionActive"
Value="True" />
<Condition Property="IsSelected"
Value="True" />
</MultiTrigger.Conditions>
<Setter TargetName="Bd"
Property="Background"
Value="#FFD3D3D3" />
</MultiTrigger>
<Trigger Property="IsEnabled"
Value="False">
<Setter TargetName="Bd"
Property="TextElement.Foreground"
Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>

Styling Multiple Menus in WPF

I'm new to WPF and am trying to figure out how to customize menus for a Windows 7 touch screen application. I'm using the xaml below that was taken from another question on StackOverflow to style one of the menus. I now want to style another menu that will be used in a different way. How would I style another menu of the same type?
If the answer should be simple / something I should be able to figure out, please post a link to where I can read on how to do this type of thing. I've been reviewing MSDN for a while now and while I'm reading all sorts of stuff I already know, I'm not seeing anything helpful for me here. (Sorry, just discouraged by the constant battle to find basic information I need to complete a simple task.)
<Window.Resources>
<Style TargetType="ContextMenu">
<Setter Property="SnapsToDevicePixels" Value="True"/>
<Setter Property="OverridesDefaultStyle" Value="True"/>
<Setter Property="Grid.IsSharedSizeScope" Value="true"/>
<Setter Property="HasDropShadow" Value="True"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ContextMenu">
<Border
Name="Border"
BorderThickness="1"
BorderBrush="{DynamicResource userContextMenuBorder}"
Background="{DynamicResource userContextMenuBackground}"
MinWidth="182"
MinHeight="60"
>
<StackPanel IsItemsHost="True"
KeyboardNavigation.DirectionalNavigation="Cycle"
>
</StackPanel>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="HasDropShadow" Value="true">
<Setter TargetName="Border" Property="Padding" Value="0,3,0,3"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<!-- SimpleStyles: MenuItem -->
<Style x:Key="{x:Static MenuItem.SeparatorStyleKey}" TargetType="{x:Type Separator}">
<Setter Property="Height" Value="1"/>
<Setter Property="Margin" Value="0,4,0,4"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Separator}">
<Border BorderBrush="{DynamicResource userContextMenuSeparatorBorder}" BorderThickness="1"/>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<!-- TopLevelHeader -->
<ControlTemplate x:Key="{x:Static MenuItem.TopLevelHeaderTemplateKey}" TargetType="{x:Type MenuItem}">
<Border Name="Border" >
<Grid>
<ContentPresenter
Margin="6,3,6,3"
ContentSource="Header"
RecognizesAccessKey="True" />
<Popup
Name="Popup"
Placement="Bottom"
IsOpen="{TemplateBinding IsSubmenuOpen}"
AllowsTransparency="True"
Focusable="False"
PopupAnimation="Fade">
<Border
Name="SubmenuBorder"
SnapsToDevicePixels="True"
Background="{DynamicResource userCMSubmenuBackground}"
BorderBrush="{DynamicResource userCMSubmenuBorder}"
BorderThickness="1" >
<StackPanel
IsItemsHost="True"
KeyboardNavigation.DirectionalNavigation="Cycle" />
</Border>
</Popup>
</Grid>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsSuspendingPopupAnimation" Value="true">
<Setter TargetName="Popup" Property="PopupAnimation" Value="None"/>
</Trigger>
<Trigger Property="IsHighlighted" Value="true">
<Setter TargetName="Border" Property="Background" Value="{DynamicResource userContextMenuHighlightedBackground}"/>
<Setter TargetName="Border" Property="BorderBrush" Value="{DynamicResource userContextMenuHighlightedBorder}"/>
</Trigger>
<Trigger SourceName="Popup" Property="Popup.AllowsTransparency" Value="True">
<Setter TargetName="SubmenuBorder" Property="CornerRadius" Value="0,0,4,4"/>
<Setter TargetName="SubmenuBorder" Property="Padding" Value="0,0,0,3"/>
</Trigger>
<Trigger Property="IsEnabled" Value="False">
<Setter Property="Foreground" Value="{DynamicResource userContextMenuForeground}"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
<!-- SubmenuHeader -->
<ControlTemplate
x:Key="{x:Static MenuItem.SubmenuHeaderTemplateKey}"
TargetType="{x:Type MenuItem}">
<Border Name="Border" Background="{DynamicResource userCMSubmenuHeaderBackground}">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" SharedSizeGroup="Icon"/>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="Auto" SharedSizeGroup="Shortcut"/>
<ColumnDefinition Width="13"/>
</Grid.ColumnDefinitions>
<ContentPresenter
Name="Icon"
Margin="6,0,6,0"
VerticalAlignment="Center"
ContentSource="Icon"/>
<ContentPresenter
Name="HeaderHost"
Grid.Column="1"
ContentSource="Header"
RecognizesAccessKey="True"/>
<TextBlock x:Name="InputGestureText"
Grid.Column="2"
Text="{TemplateBinding InputGestureText}"
Margin="5,2,2,2"
DockPanel.Dock="Right"/>
<Path
Grid.Column="3"
HorizontalAlignment="Center"
VerticalAlignment="Center"
Data="M 0 0 L 0 7 L 4 3.5 Z"
Fill="#404040" />
<Popup
Name="Popup"
Placement="Right"
HorizontalOffset="-4"
IsOpen="{TemplateBinding IsSubmenuOpen}"
AllowsTransparency="True"
Focusable="False"
PopupAnimation="Fade">
<Border
Name="SubmenuBorder"
SnapsToDevicePixels="True"
Background="#FFFFFF"
BorderBrush="#888888"
BorderThickness="1" >
<StackPanel
IsItemsHost="True"
KeyboardNavigation.DirectionalNavigation="Cycle" />
</Border>
</Popup>
</Grid>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="Icon" Value="{x:Null}">
<Setter TargetName="Icon" Property="Visibility" Value="Collapsed"/>
</Trigger>
<Trigger Property="IsHighlighted" Value="true">
<Setter TargetName="Border" Property="Background">
<Setter.Value>
<LinearGradientBrush>
<GradientStop Color="#EEEEEE" Offset="0"/>
<GradientStop Color="#FFFFFF" Offset="1"/>
</LinearGradientBrush>
</Setter.Value>
</Setter>
</Trigger>
<Trigger SourceName="Popup" Property="Popup.AllowsTransparency" Value="True">
<Setter TargetName="SubmenuBorder" Property="CornerRadius" Value="4"/>
<Setter TargetName="SubmenuBorder" Property="Padding" Value="0,3,0,3"/>
</Trigger>
<Trigger Property="IsEnabled" Value="false">
<Setter Property="Foreground" Value="#888888"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
<!-- MenuItem Style -->
<Style x:Key="{x:Type MenuItem}" TargetType="{x:Type MenuItem}">
<Setter Property="OverridesDefaultStyle" Value="True"/>
<Style.Triggers>
<Trigger Property="Role" Value="TopLevelHeader">
<Setter Property="Template" Value="{StaticResource {x:Static MenuItem.TopLevelHeaderTemplateKey}}"/>
<Setter Property="Grid.IsSharedSizeScope" Value="true"/>
</Trigger>
<Trigger Property="Role" Value="TopLevelItem">
<Setter Property="Template" Value="{StaticResource {x:Static MenuItem.TopLevelItemTemplateKey}}"/>
</Trigger>
<Trigger Property="Role" Value="SubmenuHeader">
<Setter Property="Template" Value="{StaticResource {x:Static MenuItem.SubmenuHeaderTemplateKey}}"/>
</Trigger>
<Trigger Property="Role" Value="SubmenuItem">
<Setter Property="Template" Value="{StaticResource {x:Static MenuItem.SubmenuItemTemplateKey}}"/>
</Trigger>
</Style.Triggers>
</Style>
</Window.Resources>

Give your styles different keys:
<Style TargetType="ContextMenu" x:Key="MyStyle1">
</Style>
<Style TargetType="ContextMenu" x:Key="MyStyle2">
</Style>
You then need to specify which style you want your ContextMenu to use
<ContextMenu Style="{StaticResource MyStyle1}"></ContextMenu>
<ContextMenu Style="{StaticResource MyStyle2}"></ContextMenu>
If you had any shared style for these ContextMenus, you could do this:
<Style TargetType="ContextMenu" x:Key="BaseStyle"></Style
<Style TargetType="ContextMenu" x:Key="MyStyle1" BasedOn="{StaticResource BaseStyle}">
</Style>
<Style TargetType="ContextMenu" x:Key="MyStyle2" BasedOn="{StaticResource BaseStyle}">
</Style>
MyStyle1 and MyStyle2 would then inherit any styles from BaseStyle
All the information I provided could be found here:
http://msdn.microsoft.com/en-us/library/ms745683(v=vs.110).aspx

I ended up defining the styles for the child objects in the styles style.resources.
<Style TargetType="ContextMenu" x:Key="UserMenu">
<Setter Property="SnapsToDevicePixels" Value="True"/>
<Setter Property="OverridesDefaultStyle" Value="True"/>
<Setter Property="Grid.IsSharedSizeScope" Value="true"/>
<Setter Property="HasDropShadow" Value="True"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ContextMenu">
<Border
Name="Border"
BorderThickness="1"
BorderBrush="{DynamicResource userContextMenuBorder}"
Background="{DynamicResource userContextMenuBackground}"
MinWidth="182"
MinHeight="60"
>
<StackPanel IsItemsHost="True"
KeyboardNavigation.DirectionalNavigation="Cycle"
>
</StackPanel>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="HasDropShadow" Value="true">
<Setter TargetName="Border" Property="Padding" Value="0,3,0,3"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
<Style.Resources>
<!-- SimpleStyles: MenuItem -->
<Style TargetType="{x:Type Separator}">
<Setter Property="Height" Value="1"/>
<Setter Property="Margin" Value="0,4,0,4"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Separator}">
<Border BorderBrush="{DynamicResource userContextMenuSeparatorBorder}" BorderThickness="1"/>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Style>

How to change WPF ComboBox SelectedText BackGround Color?

I have a Combobox in WPF-MVVM and i have styled the combobox with changes in the popdown box and textbox of combobox.
When i scroll the combobox listitem thier background is pink is what i have chnaged. But after selecting a item from the combobox list, the selected value in combobox item has blue background. which is the default for a combobbox in both Windows Form and WPF.
See the image for more details.
How can i change that selectedtext background color in the combobox textbox control
The combobox has
IsEditable=True property set

You can do this:
<ComboBox.Resources>
<!--Selected color when the ComboBox is focused-->
<SolidColorBrush x:Key="{x:Static SystemColors.HighlightBrushKey}" Color="Yellow" />
<!--Selected color when the ComboBox is not focused-->
<SolidColorBrush x:Key="{x:Static SystemColors.ControlBrushKey}" Color="Yellow" />
<!--selected text-->
<SolidColorBrush x:Key="{x:Static SystemColors.HighlightTextBrushKey}" Color="Yellow" />
</ComboBox.Resources>
(tested on ListBox but should work)
Another way is setting the ItemContainerStyle property of the ComboBox, and have a trigger depended on the current ComboBoxItem selection state:
<ComboBox>
<ComboBox.Resources>
<Style TargetType="TextBlock">
<Style.Triggers>
<DataTrigger Binding="{Binding IsSelected, RelativeSource={RelativeSource AncestorType=ComboBoxItem}}" Value="True">
<Setter Property="Foreground" Value="White" />
</Trigger>
</Style.Triggers>
</Style>
</ComboBox.Resources>
<ComboBox.ItemContainerStyle>
<Style TargetType="ComboBoxItem" x:Key="ContainerStyle">
<Style.Triggers>
<Trigger Property="IsSelected" Value="True">
<Setter Property="Background" Value="Red" />
</Trigger>
</Style.Triggers>
</Style>
</ComboBox.ItemContainerStyle>
</ComboBox>

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="Brushes.xaml"/>
</ResourceDictionary.MergedDictionaries>
<ControlTemplate TargetType="ToggleButton" x:Key="ComboBoxToggleButtonTemplate">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition />
<ColumnDefinition Width="20" />
</Grid.ColumnDefinitions>
<Border BorderBrush="{StaticResource LightBrush}"
CornerRadius="0"
BorderThickness="1"
Name="Border"
Background="{StaticResource WhiteBrush}"
Grid.ColumnSpan="2" />
<Border Margin="1"
BorderBrush="{StaticResource DarkBrush}"
CornerRadius="0"
BorderThickness="0"
Background="{StaticResource WhiteBrush}"
Grid.Column="0" />
<Path
Data="M0,0L4,4 8,0z"
HorizontalAlignment="Center"
Fill="{DynamicResource DefaultBrush}"
Name="Arrow"
VerticalAlignment="Center"
Width="8"
Grid.Column="1" />
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="ToggleButton.IsChecked" Value="True">
<Setter Property="Panel.Background" TargetName="Border" Value="{DynamicResource DefaultBrush}"/>
<Setter Property="Shape.Fill" TargetName="Arrow" Value="{StaticResource WhiteBrush}"/>
<Setter Property="Border.BorderBrush" TargetName="Border" Value="{DynamicResource DefaultBrush}"/>
<Setter Property="Border.BorderThickness" TargetName="Border" Value="1,1,1,0"></Setter>
</Trigger>
<Trigger Property="UIElement.IsEnabled" Value="False">
<Setter Property="Panel.Background" TargetName="Border" Value="{StaticResource DisabledBackgroundBrush}"/>
<Setter Property="Border.BorderBrush" TargetName="Border" Value="{StaticResource DisabledBorderBrush}"/>
<Setter Property="TextElement.Foreground" Value="{StaticResource DisabledForegroundBrush}"/>
<Setter Property="Shape.Fill" TargetName="Arrow" Value="#66FFFFFF"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
<ControlTemplate TargetType="TextBox" x:Key="ComboBoxTextBoxTemplate">
<Border
Name="PART_ContentHost" Background="{DynamicResource LightDefaultBrush}"
Focusable="False" />
</ControlTemplate>
<Style TargetType="{x:Type ComboBoxItem}">
<Setter Property="UIElement.SnapsToDevicePixels" Value="True"/>
<Setter Property="FrameworkElement.FocusVisualStyle" Value="{x:Null}"/>
<Setter Property="TextElement.Foreground" Value="{StaticResource ForeGroundBrush}"/>
<Setter Property="FrameworkElement.OverridesDefaultStyle" Value="True"/>
<Setter Property="Control.Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ComboBoxItem}">
<Border
Name="Border"
SnapsToDevicePixels="True"
Padding="3,2,2,2">
<ContentPresenter
ContentTemplate="{TemplateBinding ContentControl.ContentTemplate}"
Content="{TemplateBinding ContentControl.Content}" />
</Border>
<ControlTemplate.Triggers>
<Trigger Property="ComboBoxItem.IsHighlighted" Value="True">
<Setter Property="Panel.Background" TargetName="Border" Value="{DynamicResource DefaultBrush}"/>
<Setter Property="TextElement.Foreground" Value="White"></Setter>
</Trigger>
<Trigger Property="UIElement.IsEnabled" Value="False">
<Setter Property="TextElement.Foreground" Value="{StaticResource DisabledForegroundBrush}"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<Style TargetType="{x:Type ComboBox}">
<Setter Property="UIElement.SnapsToDevicePixels" Value="True"/>
<Setter Property="FrameworkElement.OverridesDefaultStyle" Value="True"/>
<Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Auto"/>
<Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto"/>
<Setter Property="ScrollViewer.CanContentScroll" Value="True"/>
<Setter Property="TextElement.Foreground" Value="{StaticResource ForeGroundBrush}"/>
<Setter Property="FrameworkElement.FocusVisualStyle" Value="{x:Null}"/>
<Setter Property="Height" Value="25"></Setter>
<Setter Property="Margin" Value="0,2,0,2"></Setter>
<Setter Property="Control.Template">
<Setter.Value>
<ControlTemplate TargetType="ComboBox">
<Grid>
<ToggleButton
ClickMode="Press"
Name="ToggleButton"
IsChecked="{Binding Path=IsDropDownOpen, RelativeSource={RelativeSource TemplatedParent}, Mode=TwoWay}"
Focusable="False"
Grid.Column="2"
Template="{StaticResource ComboBoxToggleButtonTemplate}"/>
<ContentPresenter
Margin="3,3,23,3"
HorizontalAlignment="Left"
Name="ContentSite"
VerticalAlignment="Center"
ContentTemplate="{TemplateBinding ComboBox.SelectionBoxItemTemplate}"
Content="{TemplateBinding ComboBox.SelectionBoxItem}"
IsHitTestVisible="False" />
<TextBox
Margin="3,1,1,1"
Visibility="Hidden"
HorizontalAlignment="Left"
Name="PART_EditableTextBox"
Background="Transparent"
VerticalAlignment="Center"
Style="{x:Null}"
IsReadOnly="False"
Focusable="False"
xml:space="preserve"
Template="{StaticResource ComboBoxTextBoxTemplate}"/>
<Popup
Placement="Bottom"
Name="Popup"
Focusable="False"
AllowsTransparency="True"
IsOpen="{TemplateBinding ComboBox.IsDropDownOpen}"
PopupAnimation="Slide">
<Grid
MinWidth="{TemplateBinding FrameworkElement.ActualWidth}"
MaxHeight="{TemplateBinding ComboBox.MaxDropDownHeight}"
Name="DropDown"
SnapsToDevicePixels="True">
<Border
BorderBrush="{DynamicResource DefaultBrush}"
BorderThickness="1,1,1,1"
Name="DropDownBorder"
Background="{StaticResource WhiteBrush}"/>
<ScrollViewer Margin="1,0,1,0"
SnapsToDevicePixels="True">
<ItemsPresenter
KeyboardNavigation.DirectionalNavigation="Contained" />
</ScrollViewer>
</Grid>
</Popup>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="ItemsControl.HasItems" Value="False">
<Setter Property="FrameworkElement.MinHeight" TargetName="DropDownBorder" Value="95"/>
</Trigger>
<Trigger Property="UIElement.IsEnabled" Value="False">
<Setter Property="TextElement.Foreground" Value="{StaticResource DisabledForegroundBrush}"/>
</Trigger>
<Trigger Property="ItemsControl.IsGrouping" Value="True">
<Setter Property="ScrollViewer.CanContentScroll" Value="False"/>
</Trigger>
<Trigger Property="Window.AllowsTransparency" SourceName="Popup" Value="True">
<Setter Property="Border.CornerRadius" TargetName="DropDownBorder" Value="0"/>
<Setter Property="Border.BorderThickness" TargetName="DropDownBorder" Value="1,0,1,1"/>
<Setter Property="FrameworkElement.Margin" TargetName="DropDownBorder" Value="0,0,0,0"/>
</Trigger>
<Trigger Property="ComboBox.IsEditable" Value="True">
<Setter Property="KeyboardNavigation.IsTabStop" Value="False"/>
<Setter Property="UIElement.Visibility" TargetName="PART_EditableTextBox" Value="Visible"/>
<Setter Property="UIElement.Visibility" TargetName="ContentSite" Value="Hidden"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</ResourceDictionary>

In your PART_EditableTextBox the SelectionBrush property controls this background for the selected item. In the code below I set it to be transparent so it will not highlight.
<TextBox x:Name="PART_EditableTextBox"
Margin="3,3,18,3"
HorizontalAlignment="Left"
VerticalAlignment="Center"
Background="Transparent"
Focusable="True"
SelectionBrush="Transparent"
Foreground="{TemplateBinding Foreground}"
IsReadOnly="{TemplateBinding IsReadOnly}"
Style="{x:Null}"
Template="{StaticResource ComboBoxTextBox}"
Visibility="Visible" />

Styling ListView(for custom template) WPF

I have few questions about styling ListView. For example I have some style:
<Style x:Key="MyListView" TargetType="{x:Type ListView}">
<Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.WindowBrushKey}}"/>
<Setter Property="BorderBrush" Value="{StaticResource ListBorder}"/>
<Setter Property="BorderThickness" Value="1"/>
<Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
<Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Hidden"/>
<Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto"/>
<Setter Property="ScrollViewer.CanContentScroll" Value="false"/>
<Setter Property="VerticalContentAlignment" Value="Center"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ListView}">
<Border x:Name="PART_ControlBorder" SnapsToDevicePixels="true" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Padding="0">
<Grid>
<ScrollViewer Grid.Row="1"
VerticalScrollBarVisibility="Hidden"
HorizontalScrollBarVisibility="Hidden"
CanKeyboardScroll="False"
Padding="{TemplateBinding Padding}"
Focusable="false">
<ItemsPresenter x:Name="PART_ItemsPresenter" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
</ScrollViewer>
</Grid>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
<Setter Property="ItemTemplate">
<Setter.Value>
<DataTemplate>
<Border x:Name="ItemBorder" CornerRadius="4" SnapsToDevicePixels="true" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="2" Padding="1">
<Grid>
<TextBlock Text="{Binding Key}" Background="LightGray"/>
</Grid>
</Border>
</DataTemplate>
</Setter.Value>
</Setter>
<Setter Property="ItemContainerStyle">
<Setter.Value>
<Style TargetType="{x:Type ListViewItem}">
<Setter Property="HorizontalContentAlignment" Value="Stretch" />
<Style.Triggers>
<Trigger Property="IsSelected" Value="True">
<Setter Property="Background" Value="{x:Null}" />
<Setter Property="BorderBrush" Value="{x:Null}" />
<Setter Property="Foreground" Value="Black" />
</Trigger>
</Style.Triggers>
</Style>
</Setter.Value>
</Setter>
</Style>
Why are setters for Backgroud and BorderBrush not working(ItemContainerStyle)? I had to hide selection using redefinition for system Brushes, but its wrong way:
<SolidColorBrush x:Key="{x:Static SystemColors.HighlightBrushKey}" Color="#00000000"/>
How could I set BorderBrush for ItemBorder (on mouseOver event)?
How could I set BorderBrush for ItemBorder(only for selected Items)?
What shall I do to change default selection style?

I'd found answer by myself.
To set style for ItemBorder I had to create few DataTriggers and put them into DataTemplate:
<DataTemplate.Triggers>
<DataTrigger Binding="{Binding RelativeSource={RelativeSource Mode=FindAncestor,AncestorType={x:Type ListViewItem}},Path=IsSelected}" Value="True">
<Setter TargetName="ItemBorder" Property="BorderBrush" Value="Lime"/>
</DataTrigger>
<DataTrigger Binding="{Binding RelativeSource={RelativeSource Mode=FindAncestor,AncestorType={x:Type ListViewItem}}, Path=IsMouseOver}" Value="True">
<Setter TargetName="ItemBorder" Property="BorderBrush" Value="Orange"/>
</DataTrigger>
</DataTemplate.Triggers>
About question 1 and 4 I still haven't answer...(If I won't count way to change default system brushes)