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    <p>You can style the <code>ListBoxItem</code> to trigger on the <code>IsSelected</code> property. Here's an example:</p> <ul> <li><a href="http://msdn.microsoft.com/en-us/library/ms750821(v=vs.85).aspx" rel="noreferrer">ListBoxItem ControlTemplate Example</a></li> </ul> <p>and then you use it like this:</p> <pre><code>&lt;ListBox ItemContainerStyle="{StaticResource yourListBoxItemStyle}"&gt; </code></pre> <p>or directly in the <code>ListBox</code> itself:</p> <pre><code>&lt;ListBox.ItemContainerStyle&gt; &lt;Style TargetType=”ListBoxItem”&gt; ... &lt;/Style&gt; &lt;/ListBox.ItemContainerStyle&gt; </code></pre> <p><strong>Edit:</strong></p> <p>Here is a complete example with both an <code>ItemTemplate</code> and an <code>ItemContainerStyle</code> that puts a semi-opaque layer on top of the selected item.</p> <pre><code>&lt;Grid&gt; &lt;Grid.Resources&gt; &lt;x:Array Type="sys:String" x:Key="sampleData"&gt; &lt;sys:String&gt;Red&lt;/sys:String&gt; &lt;sys:String&gt;Green&lt;/sys:String&gt; &lt;sys:String&gt;Blue&lt;/sys:String&gt; &lt;/x:Array&gt; &lt;DataTemplate x:Key="listBoxItem"&gt; &lt;Rectangle Fill="{Binding}" Width="100" Height="100"/&gt; &lt;/DataTemplate&gt; &lt;Style TargetType="ListBoxItem" x:Key="listBoxItemStyle"&gt; &lt;Setter Property="Template"&gt; &lt;Setter.Value&gt; &lt;ControlTemplate TargetType="ListBoxItem"&gt; &lt;Grid&gt; &lt;ContentPresenter /&gt; &lt;Rectangle x:Name="Rectangle" Fill="Black" Opacity="0"/&gt; &lt;/Grid&gt; &lt;ControlTemplate.Triggers&gt; &lt;Trigger Property="IsSelected" Value="true"&gt; &lt;Setter TargetName="Rectangle" Property="Opacity" Value="0.5"/&gt; &lt;/Trigger&gt; &lt;/ControlTemplate.Triggers&gt; &lt;/ControlTemplate&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Style&gt; &lt;/Grid.Resources&gt; &lt;ListBox ItemsSource="{StaticResource sampleData}" ItemTemplate="{StaticResource listBoxItem}" ItemContainerStyle="{StaticResource listBoxItemStyle}" /&gt; &lt;/Grid&gt; </code></pre> <p><strong>Edit</strong></p> <p>After a comment, here is the version using a "unified" template:</p> <pre><code>&lt;Style TargetType="ListBoxItem" x:Key="listBoxItemStyle"&gt; &lt;Setter Property="Template"&gt; &lt;Setter.Value&gt; &lt;ControlTemplate TargetType="ListBoxItem"&gt; &lt;Grid&gt; &lt;Rectangle Name="Rectangle" Fill="{Binding}" Width="100" Height="100" Opacity="1"/&gt; &lt;/Grid&gt; &lt;ControlTemplate.Triggers&gt; &lt;Trigger Property="IsSelected" Value="true"&gt; &lt;Setter TargetName="Rectangle" Property="Opacity" Value="0.5"/&gt; &lt;/Trigger&gt; &lt;/ControlTemplate.Triggers&gt; &lt;/ControlTemplate&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Style&gt; </code></pre>
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    1. COso are you saying NOT to use a ItemTemplate at all?
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    2. CONo, keep using your `ItemTemplate`. The `ContentPresenter` in the `ControlTemplate` in the example will end up "expanding" your `ItemTemplate`.
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    3. COok thanks for the code, but I dont see how this will work if I want to change the property of the control (in your case the Rectangle class) within the DataTemplate as you cant access the control from the itemcontainer template
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