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WPF Cannot make the passwordbox element corners rounded

I am trying to to get my PasswordBox corners rounded to make it look more modern. I have successfully done so with my button and TexBlock. However attempting to do so with my PasswordBox does not yield the same results that I desire.
The xaml code for the PasswordBox looks like this
<PasswordBox
Grid.Column="1"
Grid.Row="5"
x:Name="paswordinput"
Margin="170,0,0,0">
<PasswordBox.Resources>
<Style TargetType="Border">
<Setter Property="CornerRadius" Value="8"></Setter>
</Style>
</PasswordBox.Resources>
</PasswordBox>
the same code worked for my TextBox and my Button. Any help would greatly be appreciated!

The PasswordBox control clears the Style of the Border so you should set the local value of the CornerRadius property in the template:
<PasswordBox
Grid.Column="1"
Grid.Row="5"
x:Name="paswordinput"
Margin="170,0,0,0">
<PasswordBox.Style>
<Style TargetType="{x:Type PasswordBox}">
<Style.Resources>
<Style TargetType="Border">
<Setter Property="CornerRadius" Value="8" />
</Style>
</Style.Resources>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type PasswordBox}">
<Border x:Name="border" CornerRadius="8" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" SnapsToDevicePixels="True">
<ScrollViewer x:Name="PART_ContentHost" Focusable="false" HorizontalScrollBarVisibility="Hidden" VerticalScrollBarVisibility="Hidden"/>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsEnabled" Value="false">
<Setter Property="Opacity" TargetName="border" Value="0.56"/>
</Trigger>
<Trigger Property="IsMouseOver" Value="true">
<Setter Property="BorderBrush" TargetName="border" Value="#FF7EB4EA"/>
</Trigger>
<Trigger Property="IsKeyboardFocused" Value="true">
<Setter Property="BorderBrush" TargetName="border" Value="#FF569DE5"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
<Style.Triggers>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsInactiveSelectionHighlightEnabled" Value="true"/>
<Condition Property="IsSelectionActive" Value="false"/>
</MultiTrigger.Conditions>
<Setter Property="SelectionBrush" Value="{DynamicResource {x:Static SystemColors.InactiveSelectionHighlightBrushKey}}"/>
</MultiTrigger>
</Style.Triggers>
</Style>
</PasswordBox.Style>
</PasswordBox>

Hope this blog post will help - https://www.kailashsblogs.com/2017/01/round-corner-passwordbox-in-wpf.html
Use the below code -
<PasswordBox Margin="10" Height="50" Width="200">
<PasswordBox.Template>
<ControlTemplate TargetType="PasswordBox">
<Border CornerRadius="10" BorderBrush="Gray" BorderThickness="1" />
</ControlTemplate>
</PasswordBox.Template>
</PasswordBox>

You could also try to use the following code to set rounded corners for Password. For more details, please refer to here.
<PasswordBox x:Name="paswordinput" Width="100" Height="50">
<PasswordBox.Resources>
<Style TargetType="PasswordBox">
<Setter Property="Template" >
<Setter.Value>
<ControlTemplate>
<Border CornerRadius="10" BorderBrush="Gray" BorderThickness="2" />
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</PasswordBox.Resources>
</PasswordBox>

Treeview Toggle Button Style working only for Parent Node and not for Child Nodes

I have a treeview, for which I wrote the style template of treeview in App.xaml, as I need to apply the style in two or three treeviews in my application. Now my problem is that the togglebutton style works for parent and not for child nodes.
Here for the togglebutton collapse and expand, i added two images(
Resources/Images/arrowexpand.png
and
Resources/Images/arrowcollapse.png
It is working perfectly with parent nodes, but not with child and subchild nodes.
For the child and subchild nodes, the default triangle button comes.
I didn't use MVVM. I don't know where I am going wrong
In the treeview
<TreeView x:Name="myTreeview" ItemContainerStyle="{StaticResource ms}"/>
Here is my code in App.xaml
<Style TargetType="TreeView">
<Setter Property="OverridesDefaultStyle" Value="True"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="TreeView">
<Border Name="Border" CornerRadius="5" BorderThickness="2">
<Border.BorderBrush>
<SolidColorBrush Color="DarkGreen"/>
</Border.BorderBrush>
<ItemsPresenter/>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<Style x:Key="ExpandCollapseToggleStyle" TargetType="ToggleButton">
<Setter Property="Focusable" Value="False"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ToggleButton">
<Image x:Name="image" Source="Resources/Images/arrowcollapse.png" />
<ControlTemplate.Triggers>
<Trigger Property="IsChecked" Value="true">
<Setter TargetName="image" Property="Source" Value="Resources/Images/arrowexpand.png" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<Style x:Key="ms" TargetType="TreeViewItem" >
<Setter Property="IsExpanded" Value="True"/>
<Setter Property="Background" Value="Transparent"/>
<Setter Property="Padding" Value="1,0,0,0"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="TreeViewItem">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition MinWidth="19" Width="Auto"/>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition/>
</Grid.RowDefinitions>
<!-- Connecting Lines -->
<Rectangle x:Name="HorLn" Margin="9,1,0,0" Height="1" Stroke="#DCDCDC" SnapsToDevicePixels="True"/>
<Rectangle x:Name="VerLn" Width="1" Stroke="#DCDCDC" Margin="0,0,1,0" Grid.RowSpan="2" SnapsToDevicePixels="true" Fill="White"/>
<ToggleButton Margin="-1,0,0,0" x:Name="Expander" Style="{StaticResource ExpandCollapseToggleStyle}" IsChecked="{Binding Path=IsExpanded, RelativeSource={RelativeSource TemplatedParent}}" ClickMode="Press"/>
<ToggleButton Margin="-1,0,0,0" x:Name="Collapsed" Style="{StaticResource ExpandCollapseToggleStyle}" IsChecked="{Binding Path=IsExpanded, RelativeSource={RelativeSource TemplatedParent}}" ClickMode="Press"/>
<Border Name="Bd" Grid.Column="1" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Padding="{TemplateBinding Padding}" SnapsToDevicePixels="True">
<ContentPresenter x:Name="PART_Header" ContentSource="Header" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" MinWidth="20"/>
</Border>
<ItemsPresenter x:Name="ItemsHost" Grid.Row="1" Grid.Column="1" Grid.ColumnSpan="2"/>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsExpanded" Value="False">
<Setter TargetName="ItemsHost" Property="Visibility" Value="Collapsed"/>
</Trigger>
<Trigger Property="HasItems" Value="false">
<Setter TargetName="Expander" Property="Visibility" Value="Hidden"/>
</Trigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="HasHeader" Value="false"/>
<Condition Property="Width" Value="Auto"/>
</MultiTrigger.Conditions>
<Setter TargetName="PART_Header" Property="MinWidth" Value="75"/>
</MultiTrigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="HasHeader" Value="false"/>
<Condition Property="Height" Value="Auto"/>
</MultiTrigger.Conditions>
<Setter TargetName="PART_Header" Property="MinHeight" Value="19"/>
</MultiTrigger>
<Trigger Property="IsSelected" Value="true">
<Setter TargetName="Bd" Property="Background" 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 TargetName="Bd" Property="Background" Value="Green"/>
<Setter Property="Foreground" Value="White"/>
</MultiTrigger>
<Trigger Property="IsEnabled" Value="false">
<Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
I want the arrow button to be for the child items and subchild items. Please tell me where I am wrong

I found out the Solution. Actually I am trying to apply the styles for the derived classes of the treeview item. So only my style was not working.
What I did was I just added this style statement in my Constructor of the derived Class
Style = (Style)FindResource(typeof(TreeViewItem));
Then the style was applied to all the items in the treeview.

Wrong hover effect on the child elements of a WPF TreeView

I would like to ask you an issue that I cannot solve. I have templated a WPF TreeView as follows:
<Style x:Key="TreeViewItemStyle" TargetType="{x:Type TreeViewItem}">
<Setter Property="Focusable"
Value="True" />
<Setter Property="IsExpanded"
Value="True" />
<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="HorizontalAlignment"
Value="Stretch" />
<Setter Property="Width"
Value="{Binding Path=ActualWidth, RelativeSource={RelativeSource AncestorType={x:Type TreeView}}}" />
<Setter Property="Foreground"
Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type TreeViewItem}">
<Grid Name="PART_grid">
<Grid.ColumnDefinitions>
<ColumnDefinition MinWidth="19" Width="Auto"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition/>
</Grid.RowDefinitions>
<ToggleButton x:Name="Expander"
ClickMode="Press"
IsChecked="{Binding IsExpanded, RelativeSource={RelativeSource TemplatedParent}}"
Style="{StaticResource ExpandCollapseToggleStyle}"/>
<Border x:Name="Bd"
Grid.Column="1"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}"
Background="{TemplateBinding Background}"
Padding="{TemplateBinding Padding}"
SnapsToDevicePixels="true">
<ContentPresenter x:Name="PART_Header"
ContentSource="Header"
HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
</Border>
<ItemsPresenter x:Name="ItemsHost" Grid.Row="1" Grid.Column="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="IsMouseOver" Value="true">
<Setter Property="Cursor" Value="Hand" />
<Setter TargetName="PART_grid"
Property="Background"
Value="#e6f2fa" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
The problem is that the hover effect is really terrible. In fact, if the user goes on the TreeviewItem the effect should affect only the relative children and not the whole wrapper.
How can I solve this problem and make the hover effect fall only on the single element, parent or child?
Thank you so much and have a good day everyone

I suppose you are using the HierarchicalDataTemplate for your items.
In that case, the 'terrible' hover effect is actually working exactly as you specify it. E.g. the Sergio item will contain other sub-items. When you hover on Alessandro, the Sergio item actually contains the mouse too, because this Sergio item is that large and contains all the other sub-items, including Alessandro.
You have two options now.
Either do it in your data template, something like:
<HierarchicalDataTemplate ItemsSource="{Binding SubItems}">
<TextBlock x:Name="HeaderText" Text="{Binding Name}"/>
<HierarchicalDataTemplate.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter TargetName="HeaderText" Property="Background" Value="Red"/>
</Trigger>
</HierarchicalDataTemplate.Triggers>
</HierarchicalDataTemplate>
Or set the color not on the grid, but on the header only:
<Trigger Property="IsMouseOver" Value="true" SourceName="Bd">
<Setter Property="Cursor" Value="Hand" />
<Setter TargetName="Bd" Property="Background" Value="#e6f2fa" />
</Trigger>
Note that I added SourceName="Bd" to the trigger: we only want to change the color when the corresponding header contains the mouse cursor.

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" />