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POTrouble binding a checkable MenuItem to parent Window's Topmost (always on top) property
 

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  1. POTrouble binding a checkable MenuItem to parent Window's Topmost (always on top) property
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    <p>I can't figure out where I'm going wrong here. Hopefully one of you can help.</p> <p>I have a Window that contains a TabControl. The TabControl has a ContextMenu with a checkable item for "always-on-top" behavior. I want to bind this checkable item to the containing Window's boolean Topmost property.</p> <p>No matter what I do, the binding fails and I get a "Cannot find source for binding" error in my debug output.</p> <p><em>(These excerpts are greatly simplified from my actual code. I hope I didn't accidentally cut out anything relevant.)</em></p> <p><strong>First I tried this:</strong></p> <pre><code>&lt;Window x:Name="myWindow" (blah blah other properties)&gt; &lt;TabControl x:Name="tabControl"&gt; &lt;TabControl.ContextMenu&gt; &lt;ContextMenu&gt; &lt;MenuItem Header="Always on Top" IsCheckable="True" IsChecked="{Binding ElementName=myWindow, Path=Topmost, Mode=TwoWay}"/&gt; &lt;/ContextMenu&gt; ... </code></pre> <p>That didn't work. Is it because the MenuItem is inside of the Window "myWindow"? Do I need to use a RelativeSource Ancestor binding?</p> <p><strong>So I tried this:</strong></p> <pre><code>&lt;Window x:Name="myWindow" (blah blah other properties)&gt; &lt;TabControl x:Name="tabControl"&gt; &lt;TabControl.ContextMenu&gt; &lt;ContextMenu&gt; &lt;MenuItem Header="Always on Top" IsCheckable="True" IsChecked="{Binding RelativeSource={ RelativeSource FindAncestor, AncestorType={x:Type Window} }, Path=Topmost, Mode=TwoWay}"/&gt; &lt;/ContextMenu&gt; ... </code></pre> <p>That didn't work either.</p> <p>So now I'm stuck. How do I make this binding work?</p> <p>Note: My code-behind is not doing anything with these elements. Do I need to set Window.DataContext or something? That could possibly break other parts of this window.</p>
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