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    copied!<p>@Rachel is right. Your <code>DataTemplateSelector</code> only gets invoked once at load pretty much and not for <code>INPC</code> changes.</p> <p>What you can do for what you require is use a <code>ListBoxItemStyle</code> with <code>DataTrigger</code> switching the <code>Template</code> used</p> <p>something like:</p> <pre><code>&lt;ControlTemplate x:Key="greenItemTemplate"&gt; &lt;Border BorderBrush="Green" BorderThickness="3"&gt; &lt;StackPanel HorizontalAlignment="Stretch"&gt; &lt;TextBlock Text="{Binding Path=GroupName}" /&gt; &lt;TextBlock Text="{Binding Path=myType}" /&gt; &lt;/StackPanel&gt; &lt;/Border&gt; &lt;/ControlTemplate&gt; &lt;ControlTemplate x:Key="redItemTemplate"&gt; &lt;Border BorderBrush="Red" BorderThickness="3"&gt; &lt;StackPanel HorizontalAlignment="Stretch"&gt; &lt;TextBlock Text="{Binding Path=GroupName}" /&gt; &lt;TextBlock Text="{Binding Path=myType}" /&gt; &lt;/StackPanel&gt; &lt;/Border&gt; &lt;/ControlTemplate&gt; &lt;ControlTemplate x:Key="yellowItemTemplate"&gt; &lt;Border BorderBrush="Yellow" BorderThickness="3"&gt; &lt;StackPanel HorizontalAlignment="Stretch"&gt; &lt;TextBlock Text="{Binding Path=GroupName}" /&gt; &lt;TextBlock Text="{Binding Path=myType}" /&gt; &lt;/StackPanel&gt; &lt;/Border&gt; &lt;/ControlTemplate&gt; &lt;Style x:Key="MyListBoxItemStyle" TargetType="{x:Type ListBoxItem}"&gt; &lt;Setter Property="Template" Value="{DynamicResource greenItemTemplate}" /&gt; &lt;Style.Triggers&gt; &lt;DataTrigger Binding="{Binding myType}" Value="c"&gt; &lt;Setter Property="Template" Value="{DynamicResource redItemTemplate}" /&gt; &lt;/DataTrigger&gt; &lt;DataTrigger Binding="{Binding myType}" Value="b"&gt; &lt;Setter Property="Template" Value="{DynamicResource yellowItemTemplate}" /&gt; &lt;/DataTrigger&gt; &lt;/Style.Triggers&gt; &lt;/Style&gt; </code></pre> <p>and usage:</p> <pre><code>&lt;ListBox ItemContainerStyle="{StaticResource MyListBoxItemStyle}" ItemsSource="{Binding myCollectionOfMyClassObjects}" Name="listBox1" HorizontalContentAlignment="Stretch" /&gt; </code></pre>
 

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