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    copied!<p>There is no need to get into anything as despicable as owner-draw-- we are talking about <em>WPF</em> here, not WinForms. In WinForms, your only solution was to write more code. In WPF, we can solve this problem with a few very simple custom templates. For this example, I used <a href="http://kaxaml.com/" rel="noreferrer">Kaxaml</a>, a free light-weight XAML editor. No code-behind was required. <strong>Kaxaml</strong> comes packed with a bunch of "starter" styles called <em>Simple Styles</em>. I used the <em>ComboBox Simple Style</em> and made modifications from that. So although this looks like a lot of XAML, I really just started with the boilerplate one and added a couple lines. </p> <p>You can probably think of more elegant ways of triggering the font weight change; I used <code>SelectedIndex</code>.</p> <pre><code>&lt;Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"&gt; &lt;Page.Resources&gt; &lt;DataTemplate x:Key="SelectionBoxTextTemplate"&gt; &lt;TextBlock FontWeight="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ComboBox}}, Path=FontWeight}" Text="{Binding}"/&gt; &lt;/DataTemplate&gt; &lt;ControlTemplate x:Key="ComboBoxToggleButton" TargetType="{x:Type ToggleButton}"&gt; &lt;Grid&gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition/&gt; &lt;ColumnDefinition Width="20"/&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;Border x:Name="Border" Grid.ColumnSpan="2" Background="#C0C0C0" BorderBrush="#404040" BorderThickness="1" CornerRadius="2"/&gt; &lt;Border Grid.Column="0" Margin="1" Background="#FFFFFF" BorderBrush="#404040" BorderThickness="0,0,1,0" CornerRadius="2,0,0,2"/&gt; &lt;Path x:Name="Arrow" Grid.Column="1" HorizontalAlignment="Center" VerticalAlignment="Center" Data="M 0 0 L 4 4 L 8 0 Z" Fill="#404040"/&gt; &lt;/Grid&gt; &lt;ControlTemplate.Triggers&gt; &lt;Trigger Property="ToggleButton.IsMouseOver" Value="true"&gt; &lt;Setter TargetName="Border" Property="Background" Value="#808080"/&gt; &lt;/Trigger&gt; &lt;Trigger Property="ToggleButton.IsChecked" Value="true"&gt; &lt;Setter TargetName="Border" Property="Background" Value="#E0E0E0"/&gt; &lt;/Trigger&gt; &lt;Trigger Property="IsEnabled" Value="False"&gt; &lt;Setter TargetName="Border" Property="Background" Value="#EEEEEE"/&gt; &lt;Setter TargetName="Border" Property="BorderBrush" Value="#AAAAAA"/&gt; &lt;Setter Property="Foreground" Value="#888888"/&gt; &lt;Setter TargetName="Arrow" Property="Fill" Value="#888888"/&gt; &lt;/Trigger&gt; &lt;/ControlTemplate.Triggers&gt; &lt;/ControlTemplate&gt; &lt;Style x:Key="{x:Type ComboBox}" TargetType="{x:Type ComboBox}"&gt; &lt;Setter Property="SnapsToDevicePixels" Value="true"/&gt; &lt;Setter Property="OverridesDefaultStyle" Value="true"/&gt; &lt;Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Auto"/&gt; &lt;Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto"/&gt; &lt;Setter Property="ScrollViewer.CanContentScroll" Value="true"/&gt; &lt;Setter Property="MinWidth" Value="120"/&gt; &lt;Setter Property="MinHeight" Value="20"/&gt; &lt;Setter Property="Template"&gt; &lt;Setter.Value&gt; &lt;ControlTemplate TargetType="{x:Type ComboBox}"&gt; &lt;Grid&gt; &lt;ToggleButton Name="ToggleButton" Grid.Column="2" ClickMode="Press" Focusable="false" IsChecked="{Binding Path=IsDropDownOpen,Mode=TwoWay,RelativeSource={RelativeSource TemplatedParent}}" Template="{StaticResource ComboBoxToggleButton}"&gt; &lt;/ToggleButton&gt; &lt;ContentPresenter Name="ContentSite" HorizontalAlignment="Left" Margin="3,3,23,3" VerticalAlignment="Center" Content="{TemplateBinding SelectionBoxItem}" ContentTemplate="{StaticResource SelectionBoxTextTemplate}" ContentTemplateSelector="{TemplateBinding ItemTemplateSelector}" IsHitTestVisible="False"/&gt; &lt;TextBox x:Name="PART_EditableTextBox" HorizontalAlignment="Left" Margin="3,3,23,3" VerticalAlignment="Center" Background="Transparent" Focusable="False" IsReadOnly="{TemplateBinding IsReadOnly}" Style="{x:Null}" Visibility="Hidden"/&gt; &lt;Popup Name="Popup" AllowsTransparency="True" Focusable="False" IsOpen="{TemplateBinding IsDropDownOpen}" Placement="Bottom" PopupAnimation="Slide"&gt; &lt;Grid Name="DropDown" MaxHeight="{TemplateBinding MaxDropDownHeight}" MinWidth="{TemplateBinding ActualWidth}" SnapsToDevicePixels="True"&gt; &lt;Border x:Name="DropDownBorder" Background="#FFFFFF" BorderBrush="#888888" BorderThickness="1"/&gt; &lt;ScrollViewer Margin="4,6,4,6" SnapsToDevicePixels="True"&gt; &lt;StackPanel IsItemsHost="True" KeyboardNavigation.DirectionalNavigation="Contained"/&gt; &lt;/ScrollViewer&gt; &lt;/Grid&gt; &lt;/Popup&gt; &lt;/Grid&gt; &lt;ControlTemplate.Triggers&gt; &lt;Trigger Property="HasItems" Value="false"&gt; &lt;Setter TargetName="DropDownBorder" Property="MinHeight" Value="95"/&gt; &lt;/Trigger&gt; &lt;Trigger Property="IsEnabled" Value="false"&gt; &lt;Setter Property="Foreground" Value="#888888"/&gt; &lt;/Trigger&gt; &lt;Trigger Property="IsGrouping" Value="true"&gt; &lt;Setter Property="ScrollViewer.CanContentScroll" Value="false"/&gt; &lt;/Trigger&gt; &lt;Trigger Property="Popup.AllowsTransparency" SourceName="Popup" Value="true"&gt; &lt;Setter TargetName="DropDownBorder" Property="CornerRadius" Value="4"/&gt; &lt;Setter TargetName="DropDownBorder" Property="Margin" Value="0,2,0,0"/&gt; &lt;/Trigger&gt; &lt;Trigger Property="IsEditable" Value="true"&gt; &lt;Setter Property="IsTabStop" Value="false"/&gt; &lt;Setter TargetName="PART_EditableTextBox" Property="Visibility" Value="Visible"/&gt; &lt;Setter TargetName="ContentSite" Property="Visibility" Value="Hidden"/&gt; &lt;/Trigger&gt; &lt;Trigger Property="SelectedIndex" Value="1"&gt; &lt;Setter Property="FontWeight" Value="Bold"/&gt; &lt;/Trigger&gt; &lt;Trigger Property="SelectedIndex" Value="2"&gt; &lt;Setter Property="FontWeight" Value="Bold"/&gt; &lt;/Trigger&gt; &lt;Trigger Property="SelectedIndex" Value="3"&gt; &lt;Setter Property="FontWeight" Value="Bold"/&gt; &lt;/Trigger&gt; &lt;/ControlTemplate.Triggers&gt; &lt;/ControlTemplate&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Style&gt; &lt;Style x:Key="{x:Type ComboBoxItem}" TargetType="{x:Type ComboBoxItem}"&gt; &lt;Setter Property="SnapsToDevicePixels" Value="true"/&gt; &lt;Setter Property="OverridesDefaultStyle" Value="true"/&gt; &lt;Setter Property="FontWeight" Value="Normal"/&gt; &lt;Setter Property="Template"&gt; &lt;Setter.Value&gt; &lt;ControlTemplate TargetType="{x:Type ComboBoxItem}"&gt; &lt;Border Name="Border" Padding="2" SnapsToDevicePixels="true"&gt; &lt;ContentPresenter/&gt; &lt;/Border&gt; &lt;ControlTemplate.Triggers&gt; &lt;Trigger Property="IsHighlighted" Value="true"&gt; &lt;Setter TargetName="Border" Property="Background" Value="#DDDDDD"/&gt; &lt;/Trigger&gt; &lt;Trigger Property="IsEnabled" Value="false"&gt; &lt;Setter Property="Foreground" Value="#888888"/&gt; &lt;/Trigger&gt; &lt;/ControlTemplate.Triggers&gt; &lt;/ControlTemplate&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Style&gt; &lt;/Page.Resources&gt; &lt;StackPanel HorizontalAlignment="Center" VerticalAlignment="Center"&gt; &lt;TextBlock Margin="5" Text="What is your favorite primary colour?"/&gt; &lt;ComboBox Width="150" SelectedIndex="0"&gt; &lt;ComboBoxItem&gt;No Preference&lt;/ComboBoxItem&gt; &lt;ComboBoxItem&gt;Red&lt;/ComboBoxItem&gt; &lt;ComboBoxItem&gt;Green&lt;/ComboBoxItem&gt; &lt;ComboBoxItem&gt;Blue&lt;/ComboBoxItem&gt; &lt;/ComboBox&gt; &lt;/StackPanel&gt; &lt;/Page&gt; </code></pre> <p>I used the <code>ContentTemplate</code> property of the <code>ContentPresenter</code> in <code>ComboBox</code> to add a custom data template (<code>SelectionBoxTextTemplate</code>). That <code>TextBlock</code> grabs its <code>FontWeight</code> from an ancestor combo-box. I then added a template for the individual items, that forces them to normal font weight. This got the result you were looking for:</p> <p><img src="https://i.stack.imgur.com/3EjzP.png" alt="enter image description here"></p>
 

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