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    copied!<p>I figured out the things I was doing wrong. There were several things wrong. Here are the main points:</p> <p>1) I should have been using an itemsControl</p> <p>2) I didn't need to use HierarchicalDataTemplate</p> <p>3) I needed three levels of controls: a TextBox inside an itemsControl inside an itemsControl... and this can be accomplished using two DataTemplates. The top-level itemsControl refers to a DataTemplate that holds an inner itemsControl. That itemsControl then refers to a DataTemplate that holds an inner TextBox.</p> <p>And here is the correct xaml:</p> <pre><code>&lt;UserControl.Resources&gt; &lt;ResourceDictionary&gt; &lt;ObjectDataProvider x:Key="TheData" /&gt; &lt;DataTemplate x:Key="ElementTemplate"&gt; &lt;TextBox Text="{Binding Path=df_myValue}"/&gt; &lt;/DataTemplate&gt; &lt;DataTemplate x:Key="ElementSetTemplate"&gt; &lt;GroupBox Header="I am a GroupBox"&gt; &lt;ItemsControl ItemsSource="{Binding Path=df_elementSet}" ItemTemplate="{StaticResource ElementTemplate}"&gt; &lt;ItemsControl.ItemsPanel&gt; &lt;ItemsPanelTemplate&gt; &lt;StackPanel /&gt; &lt;/ItemsPanelTemplate&gt; &lt;/ItemsControl.ItemsPanel&gt; &lt;/ItemsControl&gt; &lt;/GroupBox&gt; &lt;/DataTemplate&gt; &lt;/ResourceDictionary&gt; &lt;/UserControl.Resources&gt; &lt;Grid&gt; &lt;ItemsControl ItemsSource="{Binding Source={StaticResource TheData}, Path=df_basicSet}" ItemTemplate="{StaticResource ElementSetTemplate}"&gt; &lt;ItemsControl.ItemsPanel&gt; &lt;ItemsPanelTemplate&gt; &lt;StackPanel /&gt; &lt;/ItemsPanelTemplate&gt; &lt;/ItemsControl.ItemsPanel&gt; &lt;/ItemsControl&gt; &lt;/Grid&gt; </code></pre> <p>Hope this helps someone else...</p>
 

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