title: How to put a user control in a static layer ontop of all other controls?
body: <p>I'm developing an autocomplete user control for WPF using XAML and C#.</p>
  
  <p>I would like to have the pop-up for the suggestions to appear above all controls. Currently my pop up is a <code>ListView</code> . That causes problems since whenever I decide to show it the UI must find a place for it and to do so moves all the controls which are below it further down.</p>
  
  <p>How can I avoid this? I assume I must put it in a layer which is above all of the other controls?</p>