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    <p>While H.B.'s answer will work, a more unobtrusive way to do this is through a new <a href="http://msdn.microsoft.com/en-us/library/ms749011.aspx" rel="nofollow">attached property</a>.</p> <p>Let's call it MoreCommand.</p> <p>You bind the Button to MoreCommand in the control template and bind MoreCommand to the command on the ViewModel at the point you declare the ComboBox instances.</p> <p>Details.</p> <p>1.) You create a static class that provides an attached property</p> <pre><code>public static class AttachedCommand { public static readonly DependencyProperty CommandProperty = DependencyProperty.RegisterAttached("Command", typeof(ICommand), typeof(AttachedCommand)); public static bool GetCommand(DependencyObject dependencyObject) { return (bool)dependencyObject.GetValue(CommandProperty); } public static void SetCommand(DependencyObject dependencyObject, bool value) { dependencyObject.SetValue(CommandProperty, value); } } </code></pre> <p>2.) You add support to your control template for this attached property</p> <pre><code> &lt;Popup x:Name="PART_Popup" IsOpen="{TemplateBinding IsDropDownOpen}"&gt; &lt;Border x:Name="PopupBorder" HorizontalAlignment="Stretch" Height="Auto" MinWidth="{TemplateBinding ActualWidth}" MaxHeight="{TemplateBinding MaxDropDownHeight}" BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="Black" Background="White" CornerRadius="3"&gt; &lt;ScrollViewer x:Name="ScrollViewer" BorderThickness="0" Padding="1"&gt; &lt;StackPanel&gt; &lt;ItemsPresenter/&gt; &lt;Button Command={TemplateBinding local:AttachedCommand.Command}&gt;Other&lt;/Button&gt; &lt;/StackPanel&gt; &lt;/ScrollViewer&gt; &lt;/Border&gt; &lt;/Popup&gt; </code></pre> <p>Make sure that you define the "local" namespace.</p> <p>3.) In your view, you bind the attached property to you view model</p> <pre><code>&lt;ComboBox ItemsSource={Binding Items} local:AttachedCommand.Command={Binding FetchMoreItems} /&gt; </code></pre> <p>The advantage is that you don't need to subclass Combobox, and you could potentially combine multiple "customizations" of the same control in the future, without the risk of class explosion.</p>
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    1. USCsaba Fabian
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    1. COSo would there be a property on the combo box ComboBox.MoreCommand that I can set the command on, which would then be an ICommand in my view model?
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    2. COAdded implementation details to the answer, hope this makes it clearer.
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    3. COI ended up having to go for a work-around solution due to time constraints, but this will definitely be my method of choice in future. The implementation details definitely helped because i am very new to WPF. Thanks!
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