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    <p>Here's what I would do, first I would separate my reusable parts into resources, and reference them using <code>ContentControls</code> in XAML. This applies to the <code>Popup</code> as well as to the <code>Button</code>. However I don't wish to restrict myself to having only a button, so I'll use a <code>ContentControl</code> as well for that:</p> <p>The Popup template:</p> <pre><code>&lt;ControlTemplate x:Key="PopupTemplate"&gt; &lt;Border Background="White" BorderBrush="Black" Padding="5" BorderThickness="2" CornerRadius="5"&gt; &lt;StackPanel Orientation="Vertical"&gt; &lt;Button Command="{Binding MyCommand}" CommandParameter="5"&gt;5&lt;/Button&gt; &lt;Button Command="{Binding MyCommand}" CommandParameter="10"&gt;10&lt;/Button&gt; &lt;Button Command="{Binding MyCommand}" CommandParameter="15"&gt;15&lt;/Button&gt; &lt;Button Command="{Binding MyCommand}" CommandParameter="20"&gt;20&lt;/Button&gt; &lt;/StackPanel&gt; &lt;/Border&gt; &lt;/ControlTemplate&gt; </code></pre> <p>The <code>ContentControl</code> template:</p> <pre><code>&lt;ControlTemplate x:Key="MyControlTemplate" TargetType="ContentControl"&gt; &lt;Grid Name="MyControl"&gt; &lt;ContentPresenter Content="{TemplateBinding Content}"/&gt; &lt;Popup Name="MyPopup" StaysOpen="True" Placement="Bottom"&gt; &lt;ContentControl Template="{StaticResource PopupTemplate}"/&gt; &lt;/Popup&gt; &lt;/Grid&gt; &lt;ControlTemplate.Triggers&gt; &lt;Trigger SourceName="MyControl" Property="UIElement.IsMouseOver" Value="True"&gt; &lt;Setter TargetName="MyPopup" Property="Popup.IsOpen" Value="True"/&gt; &lt;/Trigger&gt; &lt;/ControlTemplate.Triggers&gt; &lt;/ControlTemplate&gt; </code></pre> <p>Now in the main window XAML, I would create the following:</p> <pre><code>&lt;ContentControl Template="{StaticResource MyControlTemplate}"&gt; &lt;Button Content="Test"/&gt; &lt;/ContentControl&gt; </code></pre> <p>If you have any questions, I'll be happy to answer.</p>
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    1. COThanks for the help! It certainly sounds like a good direction to go in. I'll let you know how it goes!
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    2. COIt's almost working! My only issue now is that when I click somewhere else in the GUI, the Popup disappears (which is what I want), but when I hover over the ContentControl again, the Popup doesn't appear again. Do I have to explicitly set IsOpen to False in another trigger? Ideally, I would make the Popup disappear if I click somewhere that's *not* the Popup or ContentControl (i.e. some sort of compound/multi trigger).
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    3. COI think the problem might be that you are setting `IsOpen` to false somewhere explicitly, thus overriding the trigger. Are you doing this in code-behind? Maybe in the handlers for the command bindings in the popup buttons? If so you need to then do clear its value to reenable the trigger... This might be tricky.
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