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    copied!<p>The parent element whose style you want to inspect is not the direct parent of the TextBlock; it could be arbitrarily higher in the visual tree. So your second condition needs to look for an ancestor of a particular type like this:</p> <pre><code>&lt;Condition Binding="{Binding RelativeSource={RelativeSource AncestorType=ListBoxItem}, Path=Style}" Value="{StaticResource Suggestion}" /&gt; </code></pre> <p>Here is a complete working example, tested with .NET4:</p> <pre><code>&lt;Window x:Class="WpfApplication1.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"&gt; &lt;Window.Resources&gt; &lt;Style x:Key="Suggestion" TargetType="{x:Type ListBoxItem}"&gt; &lt;Setter Property="Template"&gt; &lt;Setter.Value&gt; &lt;ControlTemplate TargetType="ListBoxItem"&gt; &lt;Grid Name="Container" Margin="0,0,0,0"&gt; &lt;Rectangle Margin="0,2,0,2" Stroke="Blue" Name="Background" SnapsToDevicePixels="True" RadiusX="7" RadiusY="7" Width="Auto" Height="Auto" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"&gt;&lt;/Rectangle&gt; &lt;Rectangle Margin="2,4,2,4" Name="BackgroundTwo" StrokeThickness="3" SnapsToDevicePixels="True" RadiusX="3" RadiusY="3" Width="Auto" Height="Auto" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"&gt;&lt;/Rectangle&gt; &lt;ContentPresenter Margin="0"/&gt; &lt;/Grid&gt; &lt;/ControlTemplate&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Style&gt; &lt;Style x:Key="PinnedSuggestion" TargetType="{x:Type ListBoxItem}"&gt; &lt;Setter Property="Template"&gt; &lt;Setter.Value&gt; &lt;ControlTemplate TargetType="ListBoxItem"&gt; &lt;Grid Name="Container" Margin="0,0,0,0"&gt; &lt;Rectangle Margin="0,2,0,2" Stroke="Green" Name="Background" SnapsToDevicePixels="True" RadiusX="7" RadiusY="7" Width="Auto" Height="Auto" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"&gt;&lt;/Rectangle&gt; &lt;Rectangle Margin="2,4,2,4" Name="BackgroundTwo" StrokeThickness="3" SnapsToDevicePixels="True" RadiusX="3" RadiusY="3" Width="Auto" Height="Auto" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"&gt;&lt;/Rectangle&gt; &lt;ContentPresenter Margin="0"/&gt; &lt;/Grid&gt; &lt;/ControlTemplate&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Style&gt; &lt;Style x:Key="Neutral" TargetType="{x:Type ListBoxItem}"&gt; &lt;Setter Property="Template"&gt; &lt;Setter.Value&gt; &lt;ControlTemplate TargetType="ListBoxItem"&gt; &lt;Grid Name="Container" Margin="0,0,0,0"&gt; &lt;Rectangle Margin="0,2,0,2" Stroke="Black" Name="Background" SnapsToDevicePixels="True" RadiusX="7" RadiusY="7" Width="Auto" Height="Auto" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"&gt;&lt;/Rectangle&gt; &lt;Rectangle Margin="2,4,2,4" Name="BackgroundTwo" StrokeThickness="3" SnapsToDevicePixels="True" RadiusX="3" RadiusY="3" Width="Auto" Height="Auto" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"&gt;&lt;/Rectangle&gt; &lt;ContentPresenter Margin="0"/&gt; &lt;/Grid&gt; &lt;/ControlTemplate&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Style&gt; &lt;Style TargetType="{x:Type TextBlock}"&gt; &lt;Style.Triggers&gt; &lt;MultiDataTrigger&gt; &lt;MultiDataTrigger.Conditions&gt; &lt;Condition Binding="{Binding RelativeSource={RelativeSource Self}, Path=FontSize}" Value="11" /&gt; &lt;Condition Binding="{Binding RelativeSource={RelativeSource AncestorType=ListBoxItem}, Path=Style}" Value="{StaticResource Suggestion}" /&gt; &lt;/MultiDataTrigger.Conditions&gt; &lt;Setter Property="Foreground" Value="Red"&gt;&lt;/Setter&gt; &lt;/MultiDataTrigger&gt; &lt;MultiDataTrigger&gt; &lt;MultiDataTrigger.Conditions&gt; &lt;Condition Binding="{Binding RelativeSource={RelativeSource Self}, Path=FontSize}" Value="11" /&gt; &lt;Condition Binding="{Binding RelativeSource={RelativeSource AncestorType=ListBoxItem}, Path=Style}" Value="{StaticResource PinnedSuggestion}" /&gt; &lt;/MultiDataTrigger.Conditions&gt; &lt;Setter Property="Foreground" Value="Yellow"&gt;&lt;/Setter&gt; &lt;/MultiDataTrigger&gt; &lt;/Style.Triggers&gt; &lt;/Style&gt; &lt;/Window.Resources&gt; &lt;Grid&gt; &lt;ListBox&gt; &lt;ListBoxItem Style="{StaticResource Neutral}"&gt; &lt;TextBlock FontSize="10" Text="Style=Neutral, FontSize=10"/&gt; &lt;/ListBoxItem&gt; &lt;ListBoxItem Style="{StaticResource Neutral}"&gt; &lt;TextBlock FontSize="11" Text="Style=Neutral, FontSize=11"/&gt; &lt;/ListBoxItem&gt; &lt;ListBoxItem Style="{StaticResource Suggestion}"&gt; &lt;TextBlock FontSize="10" Text="Style=Suggestion, FontSize=10"/&gt; &lt;/ListBoxItem&gt; &lt;ListBoxItem Style="{StaticResource Suggestion}"&gt; &lt;TextBlock FontSize="11" Text="Style=Suggestion, FontSize=11"/&gt; &lt;/ListBoxItem&gt; &lt;ListBoxItem Style="{StaticResource PinnedSuggestion}"&gt; &lt;TextBlock FontSize="10" Text="Style=PinnedSuggestion, FontSize=10"/&gt; &lt;/ListBoxItem&gt; &lt;ListBoxItem Style="{StaticResource PinnedSuggestion}"&gt; &lt;TextBlock FontSize="11" Text="Style=PinnedSuggestion, FontSize=11"/&gt; &lt;/ListBoxItem&gt; &lt;/ListBox&gt; &lt;/Grid&gt; </code></pre> <p></p>
 

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