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Thumb of scrollbar not working according to Content height for WPF

I working for a project and i have some trouble with Listview's scrollbar
Problem: this scrollbar thumb is shortly according to content height.
I find it. some solve but i didint find it.
what add to this style ? or discard anything
e.g content height 300 but thumb just going between up/down 0px and 30px
This is style of Scroolbar.xaml
<Style x:Key="ScrollBarTrackThumb" TargetType="{x:Type Thumb}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Thumb}">
<Grid x:Name="Grid" Height="19">
<Rectangle HorizontalAlignment="Stretch" />
<Border
x:Name="CornerScrollBarRectangle"
Margin="0,1,0,1"
Background="{TemplateBinding Background}"
CornerRadius="50" />
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="Tag" Value="Horizontal">
<Setter TargetName="CornerScrollBarRectangle" Property="Width" Value="Auto" />
<Setter TargetName="CornerScrollBarRectangle" Property="Height" Value="0" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<Style TargetType="{x:Type ScrollBar}">
<Setter Property="Stylus.IsFlicksEnabled" Value="True" />
<Setter Property="Foreground" Value="#5A3CB6" />
<Setter Property="Background" Value="{x:Null}" />
<Setter Property="Width" Value="19" />
<Setter Property="VerticalAlignment" Value="Top" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ScrollBar}">
<Grid
x:Name="GridRoot"
Width="19"
Height="300"
Background="{TemplateBinding Background}">
<Grid.RowDefinitions>
<RowDefinition Height="0.5*" />
</Grid.RowDefinitions>
<Rectangle
Width="1"
Margin="0,40"
VerticalAlignment="Stretch"
Stroke="LightGray" />
<Track
x:Name="PART_Track"
Focusable="false"
IsDirectionReversed="true">
<Track.Thumb>
<Thumb
x:Name="Thumb"
Height="19"
Margin="0,30,0,0"
VerticalAlignment="Top"
Background="{TemplateBinding Foreground}"
Style="{DynamicResource ScrollBarTrackThumb}" />
</Track.Thumb>
<Track.IncreaseRepeatButton>
<RepeatButton
x:Name="PageUp"
Command="ScrollBar.PageDownCommand"
Focusable="false"
Opacity="0" />
</Track.IncreaseRepeatButton>
<Track.DecreaseRepeatButton>
<RepeatButton
x:Name="PageDown"
Command="ScrollBar.PageUpCommand"
Focusable="false"
Opacity="0" />
</Track.DecreaseRepeatButton>
</Track>
</Grid>
<ControlTemplate.Triggers>
<Trigger SourceName="Thumb" Property="IsMouseOver" Value="true">
<Setter TargetName="Thumb" Property="Background" Value="{DynamicResource ButtonSelectBrush}" />
</Trigger>
<Trigger SourceName="Thumb" Property="IsDragging" Value="true">
<Setter TargetName="Thumb" Property="Background" Value="{DynamicResource DarkBrush}" />
</Trigger>
<Trigger Property="IsEnabled" Value="false">
<Setter TargetName="Thumb" Property="Visibility" Value="Visible" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
What can I do that?

WPF - Hide Selected Item / Text Box portion from Combobox Control

I'm looking for a way to hide the Selected Item / Textbox portion of the wpf combobox, leaving only the drop down button so users can still interact with the list.
I cannot find a property to toggle this behaviour, I was curious to know if there is a way to change visibility of certain portions of this control?
If anyone has any suggestions, It'd be greatly appreciated.

The easiest way to hide the text part is probably to set the Width of the ComboBox:
<ComboBox Width="20" />
Otherwise, you could always define your own custom ControlTemplate and set the Template property to this one but this requires some more effort.

EDIT - To use the below code you will need to use ComboBoxStyleWithoutText as a style on your combobox
To achieve this I had to re-create a combo-box and edit the template itself whilst tweaking the individual styles to suit the colour scheme of our app.
This is the result
In the application
Please feel free to use the code below, it likely has some custom colours I've used from other dictionaries (Change these to whatever suits your app)
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="Shared.xaml" />
<ResourceDictionary Source="Colours.xaml" />
<ResourceDictionary Source="Brushes.xaml" />
</ResourceDictionary.MergedDictionaries>
<!-- SimpleStyles: ComboBox -->
<ControlTemplate x:Key="ComboBoxToggleButton"
TargetType="ToggleButton">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition />
<ColumnDefinition Width="20" />
</Grid.ColumnDefinitions>
<Border x:Name="Border"
Grid.ColumnSpan="2"
CornerRadius="2"
Background="{StaticResource ScreenBackgroundBrush}"
BorderBrush="{StaticResource GridBorderBrush}"
BorderThickness="2" />
<Border Grid.Column="0"
CornerRadius="2,0,0,2"
Margin="1"
Background="{StaticResource ScreenBackgroundBrush}"
BorderBrush="{StaticResource GridBorderBrush}"
BorderThickness="1,1,1,1" />
<Path x:Name="Arrow"
Grid.Column="1"
Fill="{StaticResource SecondaryControlBrush}"
HorizontalAlignment="Center"
VerticalAlignment="Center"
Data="M 0 0 L 4 4 L 8 0 Z" />
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="ToggleButton.IsMouseOver"
Value="true">
<Setter TargetName="Border"
Property="Background"
Value="{StaticResource DataGridHeaderRowBackgroundBrush}" />
</Trigger>
<Trigger Property="ToggleButton.IsChecked"
Value="true">
<Setter TargetName="Border"
Property="Background"
Value="{StaticResource DataGridHeaderRowBackgroundBrush}" />
</Trigger>
<Trigger Property="IsEnabled"
Value="False">
<Setter Property="Opacity"
Value="0.25" />
<Setter TargetName="Border"
Property="Background"
Value="{StaticResource DisabledBackgroundBrush}" />
<Setter TargetName="Border"
Property="BorderBrush"
Value="{StaticResource DisabledBorderBrush}" />
<Setter Property="Foreground"
Value="{StaticResource DisabledForegroundBrush}" />
<Setter TargetName="Arrow"
Property="Fill"
Value="{StaticResource DisabledForegroundBrush}" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
<ControlTemplate x:Key="ComboBoxTextBox"
TargetType="TextBox">
<Border x:Name="PART_ContentHost"
Focusable="False"
Background="{TemplateBinding Background}" />
</ControlTemplate>
<Style x:Key="ComboBoxStyleWithoutText" 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="0" />
<Setter Property="MinHeight" Value="20" />
<Setter Property="Background" Value="Green" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ComboBox">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="0"></ColumnDefinition>
<ColumnDefinition MinWidth="{DynamicResource {x:Static SystemParameters.VerticalScrollBarWidthKey}}" Width="0"/>
</Grid.ColumnDefinitions>
<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="3,3,3,3"
VerticalAlignment="Center"
HorizontalAlignment="Left" />
<TextBox x:Name="PART_EditableTextBox"
Style="{x:Null}"
Template="{StaticResource ComboBoxTextBox}"
HorizontalAlignment="Left"
VerticalAlignment="Center"
Margin="3,3,3,3"
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="{StaticResource TextBoxBrush}"
BorderThickness="2"
BorderBrush="{StaticResource SolidBorderBrush}" />
<ScrollViewer Margin="4,6,2,2"
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="{StaticResource DisabledForegroundBrush}" />
</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="4" />
<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>
<Style x:Key="{x:Type ComboBox}"
TargetType="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="Template">
<Setter.Value>
<ControlTemplate TargetType="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"
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="{StaticResource TextBoxBrush}"
BorderThickness="2"
BorderBrush="{StaticResource SolidBorderBrush}" />
<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="{StaticResource DisabledForegroundBrush}" />
</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="4" />
<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="ComboBoxItem">
<Setter Property="SnapsToDevicePixels"
Value="true" />
<Setter Property="OverridesDefaultStyle"
Value="true" />
<Setter Property="Background"
Value="{StaticResource ScreenBackgroundBrush}"/>
<Setter Property="Foreground"
Value="{StaticResource PrimaryTextBrush}" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ComboBoxItem">
<Border Name="Border"
Padding="2"
SnapsToDevicePixels="true">
<ContentPresenter />
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsHighlighted"
Value="true">
<Setter TargetName="Border"
Property="Background"
Value="{StaticResource DataGridRowSelectedBrush}" />
<Setter TargetName="Border"
Property="CornerRadius"
Value="2" />
</Trigger>
<Trigger Property="IsEnabled"
Value="false">
<Setter Property="Foreground"
Value="{StaticResource DisabledForegroundBrush}" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>

How to change the color of a selected item of a ComboboxItem which includes a TextBlock?

I have the following XAML of a Combobox:
<ComboBox>
<ComboBoxItem>
<TextBlock FontWeight="Bold" Background="PaleGreen">1</TextBlock>
</ComboBoxItem>
<ComboBoxItem>
<TextBlock FontWeight="Bold" Background="Salmon">2</TextBlock>
</ComboBoxItem>
<ComboBoxItem>
<TextBlock FontWeight="Bold" Background="PaleTurquoise">3</TextBlock>
</ComboBoxItem>
<ComboBoxItem>
<TextBlock FontWeight="Bold" Background="Gold">4</TextBlock>
</ComboBoxItem>
<ComboBoxItem>
<TextBlock FontWeight="Bold" Background="Black" Foreground="White">5</TextBlock>
</ComboBoxItem>
<ComboBoxItem>
<TextBlock FontWeight="Bold" Background="Gray">6</TextBlock>
</ComboBoxItem>
</ComboBox>
The following pictures shows my problem:
Combobox open
Combobox closed
So you can see in the picture "Combobox closed" that the number "4" has no color, but I want that the text "4" is yellow. Can you help me?

#janonimus: When I add a template as you said it has following code:
<Window.Resources>
<ControlTemplate x:Key="ComboBoxControlTemplate1" TargetType="{x:Type ComboBox}">
<Grid x:Name="Placement" SnapsToDevicePixels="True">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<Popup x:Name="PART_Popup" AllowsTransparency="True" Grid.ColumnSpan="2" IsOpen="{Binding IsDropDownOpen, RelativeSource={RelativeSource TemplatedParent}}" PopupAnimation="{DynamicResource {x:Static SystemParameters.ComboBoxPopupAnimationKey}}" Placement="Bottom">
<Themes:SystemDropShadowChrome x:Name="Shdw" Color="Transparent" MaxHeight="{TemplateBinding MaxDropDownHeight}" MinWidth="{Binding ActualWidth, ElementName=Placement}">
<Border x:Name="DropDownBorder" BorderBrush="{DynamicResource {x:Static SystemColors.WindowFrameBrushKey}}" BorderThickness="1" Background="{DynamicResource {x:Static SystemColors.WindowBrushKey}}">
<ScrollViewer x:Name="DropDownScrollViewer">
<Grid RenderOptions.ClearTypeHint="Enabled">
<Canvas HorizontalAlignment="Left" Height="0" VerticalAlignment="Top" Width="0">
<Rectangle x:Name="OpaqueRect" Fill="{Binding Background, ElementName=DropDownBorder}" Height="{Binding ActualHeight, ElementName=DropDownBorder}" Width="{Binding ActualWidth, ElementName=DropDownBorder}"/>
</Canvas>
<ItemsPresenter x:Name="ItemsPresenter" KeyboardNavigation.DirectionalNavigation="Contained" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
</Grid>
</ScrollViewer>
</Border>
</Themes:SystemDropShadowChrome>
</Popup>
<Themes:ListBoxChrome x:Name="Border" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Grid.ColumnSpan="2" RenderMouseOver="{TemplateBinding IsMouseOver}" RenderFocused="{TemplateBinding IsKeyboardFocusWithin}"/>
<TextBox x:Name="PART_EditableTextBox" HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" IsReadOnly="{Binding IsReadOnly, RelativeSource={RelativeSource TemplatedParent}}" Margin="{TemplateBinding Padding}" VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}">
<TextBox.Style>
<Style TargetType="{x:Type TextBox}">
<Setter Property="OverridesDefaultStyle" Value="True"/>
<Setter Property="AllowDrop" Value="True"/>
<Setter Property="MinWidth" Value="0"/>
<Setter Property="MinHeight" Value="0"/>
<Setter Property="FocusVisualStyle" Value="{x:Null}"/>
<Setter Property="ScrollViewer.PanningMode" Value="VerticalFirst"/>
<Setter Property="Stylus.IsFlicksEnabled" Value="False"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type TextBox}">
<ScrollViewer x:Name="PART_ContentHost" Background="Transparent" Focusable="False" HorizontalScrollBarVisibility="Hidden" VerticalScrollBarVisibility="Hidden"/>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</TextBox.Style>
</TextBox>
<ToggleButton Grid.Column="1" IsChecked="{Binding IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}">
<ToggleButton.Style>
<Style TargetType="{x:Type ToggleButton}">
<Setter Property="OverridesDefaultStyle" Value="True"/>
<Setter Property="IsTabStop" Value="False"/>
<Setter Property="Focusable" Value="False"/>
<Setter Property="ClickMode" Value="Press"/>
<Setter Property="Background" Value="Transparent"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ToggleButton}">
<Themes:ButtonChrome x:Name="Chrome" BorderBrush="{TemplateBinding BorderBrush}" Background="{TemplateBinding Background}" RenderMouseOver="{TemplateBinding IsMouseOver}" RenderPressed="{TemplateBinding IsPressed}" RoundCorners="False" SnapsToDevicePixels="True" Width="{DynamicResource {x:Static SystemParameters.VerticalScrollBarWidthKey}}">
<Path x:Name="Arrow" Data="M0,0L3.5,4 7,0z" Fill="Black" HorizontalAlignment="Center" Margin="0,1,0,0" VerticalAlignment="Center"/>
</Themes:ButtonChrome>
<ControlTemplate.Triggers>
<Trigger Property="IsChecked" Value="True">
<Setter Property="RenderPressed" TargetName="Chrome" Value="True"/>
</Trigger>
<Trigger Property="IsEnabled" Value="False">
<Setter Property="Fill" TargetName="Arrow" Value="#FFAFAFAF"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</ToggleButton.Style>
</ToggleButton>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsKeyboardFocusWithin" Value="True">
<Setter Property="Foreground" Value="Black"/>
</Trigger>
<Trigger Property="IsDropDownOpen" Value="True">
<Setter Property="RenderFocused" TargetName="Border" Value="True"/>
</Trigger>
<Trigger Property="HasItems" Value="False">
<Setter Property="Height" TargetName="DropDownBorder" Value="95"/>
</Trigger>
<Trigger Property="IsEnabled" Value="False">
<Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
<Setter Property="Background" Value="#FFF4F4F4"/>
</Trigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsGrouping" Value="True"/>
<Condition>
<Condition.Value>
<System:Boolean>False</System:Boolean>
</Condition.Value>
</Condition>
</MultiTrigger.Conditions>
<Setter Property="ScrollViewer.CanContentScroll" Value="False"/>
</MultiTrigger>
<Trigger Property="HasDropShadow" SourceName="PART_Popup" Value="True">
<Setter Property="Margin" TargetName="Shdw" Value="0,0,5,5"/>
<Setter Property="Color" TargetName="Shdw" Value="#71000000"/>
</Trigger>
<Trigger Property="CanContentScroll" SourceName="DropDownScrollViewer" Value="False">
<Setter Property="Canvas.Top" TargetName="OpaqueRect" Value="{Binding VerticalOffset, ElementName=DropDownScrollViewer}"/>
<Setter Property="Canvas.Left" TargetName="OpaqueRect" Value="{Binding HorizontalOffset, ElementName=DropDownScrollViewer}"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Window.Resources>
In addition, an error is thrown as soon as I have inserted the template:
InvalidOperationException: Nicht-NULL-Wert für "Property" erforderlich.
EDIT:
I have the solution. It was quite easy :D I don't need a template. I just added triggers:
<Style TargetType="ComboBox">
<Setter Property="Background" Value="Transparent"/>
<Setter Property="FontSize" Value="10"/>
<Setter Property="HorizontalAlignment" Value="Center"/>
<Setter Property="VerticalAlignment" Value="Center"/>
<Setter Property="Width" Value="115"/>
<Setter Property="Foreground" Value="Black"/>
<Setter Property="BorderBrush" Value="White"/>
<Setter Property="SelectedIndex" Value="0"/>
<Setter Property="HorizontalContentAlignment" Value="Center"/>
<Setter Property="IsEditable" Value="True"/>
<EventSetter Event="SelectionChanged" Handler="SelectionChanged"/>
<Style.Triggers>
<Trigger Property="IsEnabled" Value="False">
<Setter Property="Opacity" Value="0.4"/>
</Trigger>
<Trigger Property="SelectedIndex" Value="0">
<Setter Property="Background" Value="PaleGreen"/>
<Setter Property="Foreground" Value="Black"/>
</Trigger>
<Trigger Property="SelectedIndex" Value="1">
<Setter Property="Background" Value="Salmon"/>
<Setter Property="Foreground" Value="Black"/>
</Trigger>
<Trigger Property="SelectedIndex" Value="2">
<Setter Property="Background" Value="PaleTurquoise"/>
<Setter Property="Foreground" Value="Black"/>
</Trigger>
<Trigger Property="SelectedIndex" Value="3">
<Setter Property="Background" Value="Gold"/>
<Setter Property="Foreground" Value="Black"/>
</Trigger>
<Trigger Property="SelectedIndex" Value="4">
<Setter Property="Background" Value="Black"/>
<Setter Property="Foreground" Value="White"/>
</Trigger>
<Trigger Property="SelectedIndex" Value="5">
<Setter Property="Background" Value="Gray"/>
<Setter Property="Foreground" Value="Black"/>
</Trigger>
</Style.Triggers>
</Style>

You need to edit the template of the ComboBox.
Go to [Document Outline], right-click the ComboBox, Edit Template->Edit a Copy.
Then find the "ComboBoxEditableTemplate" and edit the Border the contains the "PART_EditableTextBox". Here's the specific part of the generated code::
...
<ControlTemplate x:Key="ComboBoxEditableTemplate"
TargetType="{x:Type ComboBox}">
<Grid x:Name="templateRoot"
SnapsToDevicePixels="true">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="0"
MinWidth="{DynamicResource {x:Static SystemParameters.VerticalScrollBarWidthKey}}" />
</Grid.ColumnDefinitions>
<Popup x:Name="PART_Popup"
Grid.ColumnSpan="2"
AllowsTransparency="true"
IsOpen="{Binding IsDropDownOpen, RelativeSource={RelativeSource TemplatedParent}}"
Placement="Bottom"
PopupAnimation="{DynamicResource {x:Static SystemParameters.ComboBoxPopupAnimationKey}}">
<Themes:SystemDropShadowChrome x:Name="shadow"
MinWidth="{Binding ActualWidth, ElementName=templateRoot}"
MaxHeight="{TemplateBinding MaxDropDownHeight}"
Color="Transparent">
<Border x:Name="dropDownBorder"
Background="{DynamicResource {x:Static SystemColors.WindowBrushKey}}"
BorderBrush="{DynamicResource {x:Static SystemColors.WindowFrameBrushKey}}"
BorderThickness="1">
<ScrollViewer x:Name="DropDownScrollViewer">
<Grid x:Name="grid"
RenderOptions.ClearTypeHint="Enabled">
<Canvas x:Name="canvas"
Width="0"
Height="0"
HorizontalAlignment="Left"
VerticalAlignment="Top">
<Rectangle x:Name="opaqueRect"
Width="{Binding ActualWidth, ElementName=dropDownBorder}"
Height="{Binding ActualHeight, ElementName=dropDownBorder}"
Fill="{Binding Background, ElementName=dropDownBorder}" />
</Canvas>
<ItemsPresenter x:Name="ItemsPresenter"
KeyboardNavigation.DirectionalNavigation="Contained"
SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
</Grid>
</ScrollViewer>
</Border>
</Themes:SystemDropShadowChrome>
</Popup>
<ToggleButton x:Name="toggleButton"
Grid.ColumnSpan="2"
Background="{TemplateBinding Background}"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}"
IsChecked="{Binding IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}"
Style="{StaticResource ComboBoxToggleButton}" />
<!-- EDIT THIS PART LIKE SO -->
<Border x:Name="border"
Margin="{TemplateBinding BorderThickness}"
Background="{Binding SelectedItem.Background, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ComboBox}}, FallbackValue=Transparent}">
<!-- Background="{StaticResource TextBox.Static.Background}"> -->
<!-- //////////////////////// -->
<TextBox x:Name="PART_EditableTextBox"
Margin="{TemplateBinding Padding}"
HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}"
VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"
IsReadOnly="{Binding IsReadOnly, RelativeSource={RelativeSource TemplatedParent}}"
Style="{StaticResource ComboBoxEditableTextBox}" />
</Border>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsEnabled" Value="false">
<Setter TargetName="border" Property="Opacity" Value="0.56" />
</Trigger>
<Trigger Property="IsKeyboardFocusWithin" Value="true">
<Setter Property="Foreground" Value="Black" />
</Trigger>
<Trigger SourceName="PART_Popup" Property="HasDropShadow" Value="true">
<Setter TargetName="shadow" Property="Margin" Value="0,0,5,5" />
<Setter TargetName="shadow" Property="Color" Value="#71000000" />
</Trigger>
<Trigger Property="HasItems" Value="false">
<Setter TargetName="dropDownBorder" Property="Height" Value="95" />
</Trigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsGrouping" Value="true" />
<Condition Property="VirtualizingPanel.IsVirtualizingWhenGrouping" Value="false" />
</MultiTrigger.Conditions>
<Setter Property="ScrollViewer.CanContentScroll" Value="false" />
</MultiTrigger>
<Trigger SourceName="DropDownScrollViewer" Property="ScrollViewer.CanContentScroll" Value="false">
<Setter TargetName="opaqueRect" Property="Canvas.Top" Value="{Binding VerticalOffset, ElementName=DropDownScrollViewer}" />
<Setter TargetName="opaqueRect" Property="Canvas.Left" Value="{Binding HorizontalOffset, ElementName=DropDownScrollViewer}" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
...
After that, you can use it like the following, without using TextBlocks:
<ComboBox IsEditable="True"
Style="{DynamicResource YourComboBoxStyleName}">
<ComboBoxItem Background="PaleGreen"
Content="1"
FontWeight="Bold" />
<ComboBoxItem Background="Salmon"
Content="2"
FontWeight="Bold" />
<ComboBoxItem Background="PaleTurquoise"
Content="3"
FontWeight="Bold" />
<ComboBoxItem Background="Gold"
Content="4"
FontWeight="Bold" />
<ComboBoxItem Background="Black"
Content="5"
FontWeight="Bold"
Foreground="White" />
<ComboBoxItem Background="Gray"
Content="6"
FontWeight="Bold" />
</ComboBox>

WPF Context Menu custom style issue

I am trying to customize context menu in WPF, and i am able to achieve it by following this example on MSDN. The last piece in the Jigsaw is the submenu title color (Submenu header).
If you notice both submenu has white on mouse hover but Submenu title takes the normal color of the submenu items (Item 1, Item , etc) even when it is highlighted.
What do i need to do to change its highlighted or mouse hover color.
<ControlTemplate x:Key="{x:Static MenuItem.SubmenuHeaderTemplateKey}" TargetType="{x:Type MenuItem}">
<Border x:Name="Border" BorderThickness="1">
<Grid Height="22">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" SharedSizeGroup="Icon" />
<ColumnDefinition Width="*" />
<ColumnDefinition Width="Auto" SharedSizeGroup="Shortcut" />
<ColumnDefinition Width="13" />
</Grid.ColumnDefinitions>
<ContentPresenter x:Name="Icon" Margin="6,0,6,0" VerticalAlignment="Center" ContentSource="Icon"/>
<ContentPresenter x:Name="HeaderHost" Margin="3,0,3,0" Grid.Column="1" VerticalAlignment="Center" ContentSource="Header" RecognizesAccessKey="True" TextOptions.TextFormattingMode="Display" />
<Path x:Name="RightArrow" Grid.Column="3" HorizontalAlignment="Center" VerticalAlignment="Center" Data="M 0 0 L 0 7 L 4 3.5 Z" Fill="#49a3e1" />
<Popup x:Name="Popup" Placement="Right" HorizontalOffset="-4" IsOpen="{TemplateBinding IsSubmenuOpen}" AllowsTransparency="True" Focusable="False" PopupAnimation="Fade">
<Border x:Name="SubmenuBorder" SnapsToDevicePixels="True" Background="White" BorderThickness="1" BorderBrush="#49a3e1">
<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 Property="Background" TargetName="Border" Value="#49a3e1"/>
<Setter Property="Fill" TargetName="RightArrow" Value="White"/>
<Setter Property="Foreground" Value="White"/>
</Trigger>
<Trigger Property="IsHighlighted" Value="false">
<Setter Property="Foreground" Value="Red"/>
</Trigger>
<Trigger SourceName="Popup" Property="AllowsTransparency" Value="True">
<Setter TargetName="SubmenuBorder" Property="Padding" Value="3" />
<Setter Property="Foreground" Value="Black"/>
</Trigger>
<Trigger Property="IsEnabled" Value="false">
<Setter Property="Foreground" Value="Pink"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>

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>