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    copied!<p>You don't want to set the <code>DataType</code> of the <code>DataTemplate</code> in this case. The value of the <code>ItemTemplate</code> property is used whenever a new item needs to be added, and in the case of a tab control it will be used to create a new <code>TabItem</code>. You should declare an instance of your class within the <code>DataTemplate</code> itself:</p> <pre><code>&lt;TabControl x:Name="tabCases" IsSynchronizedWithCurrentItem="True" Controls:ClosableTabItem.TabClose="TabClosed"&gt; &lt;TabControl.ItemTemplate&gt; &lt;DataTemplate&gt; &lt;Controls:ClosableTabItem&gt; &lt;TextBlock Text="{Binding Path=Id}" /&gt; &lt;/Controls:ClosableTabItem&gt; &lt;/DataTemplate&gt; &lt;/TabControl.ItemTemplate&gt; &lt;TabControl.ContentTemplate&gt; &lt;DataTemplate DataType="{x:Type Entities:Case}"&gt; &lt;CallLog:CaseReadOnlyDisplay DataContext="{Binding}" /&gt; &lt;/DataTemplate&gt; &lt;/TabControl.ContentTemplate&gt; &lt;/TabControl&gt; </code></pre> <p>This will cause a new <code>ClosableTabItem</code> to be created whenever a new tab is added to the <code>TabControl</code>.</p> <p><strong>Update</strong>; From your comment, it sounds like that the <code>ItemTemplate</code> controls what is created within the <code>TabItem</code>, rather than changing the <code>TabItem</code> itself. To do what you want to do, but for a <code>TreeView</code>, you would set the <code>HeaderTemplate</code>. Unfortunately, I don't see a <code>HeaderTemplate</code> property of <code>TabControl</code>.</p> <p>I did some searching, and <a href="http://www.switchonthecode.com/tutorials/the-wpf-tab-control-inside-and-out" rel="nofollow noreferrer">this tutorial</a> modifies the contents of the tab headers by adding controls to <code>TabItem.Header</code>. Maybe you could create a <code>Style</code> for your <code>TabItems</code> that would add the close button that your class is currently adding?</p>
 

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