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copied!<p>If you are using a <code>Canvas</code> or <code>Grid</code> in your layout, give the control to be put on top a higher <code>ZIndex</code>.</p> <p>From <a href="http://msdn.microsoft.com/en-us/library/system.windows.controls.panel.zindex.aspx" rel="nofollow noreferrer">MSDN</a>:</p> <pre><code><Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" WindowTitle="ZIndex Sample"> <Canvas> <Rectangle Canvas.ZIndex="3" Width="100" Height="100" Canvas.Top="100" Canvas.Left="100" Fill="blue"/> <Rectangle Canvas.ZIndex="1" Width="100" Height="100" Canvas.Top="150" Canvas.Left="150" Fill="yellow"/> <Rectangle Canvas.ZIndex="2" Width="100" Height="100" Canvas.Top="200" Canvas.Left="200" Fill="green"/>  <Rectangle Canvas.ZIndex="1" Width="100" Height="100" Canvas.Top="300" Canvas.Left="200" Fill="green"/> <Rectangle Canvas.ZIndex="3" Width="100" Height="100" Canvas.Top="350" Canvas.Left="150" Fill="yellow"/> <Rectangle Canvas.ZIndex="2" Width="100" Height="100" Canvas.Top="400" Canvas.Left="100" Fill="blue"/> </Canvas> </Page> </code></pre> <p>If you don't specify <code>ZIndex</code>, the children of a panel are rendered in the order they are specified (i.e. last one on top).</p> <p>If you are looking to do something more complicated, you can look at how <code>ChildWindow</code> is implemented in Silverlight. It overlays a semitransparent background and popup over your entire <code>RootVisual</code>.</p>

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