title: How to display multiple layers of controls in WPF?
body: <p>I am trying to learn WPF and so far I love it. However, there is something missing or simply something that I don't understand. How can we display multiple layers of controls in WPF? Attached, the screenshot gives a good idea of what I am trying to do. I have a window and I want to display something else on top of it. How can I do that?</p>
  
  <p><a href="https://i.stack.imgur.com/mf5C9.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/mf5C9.png" alt="Screenshot"></a>
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