title: can not close libvlcsharp popup in wpf
body: <p>this is my first question on stackoverflow.. i have some problem with libvlcsharp :
  when i put vlcsharp mediaElement into a popup (like below code) and run the application , vlcsharp will add 3 button on the top ,right corner of popup : minimize , maximize and close.
  minimize and maximize works fine but when i click on close button nothing happen.
  the actual code  :</p>
  <pre><code>&lt;popup&gt;
  &lt;wpf:VideoView  x:Name=&quot;myVideoControl&quot; MediaPlayer=&quot;{Binding MediaPlayer}&quot;  /&gt;
  &lt;/popup&gt;
  </code></pre>
  <p>screenshot from popup :
  <a href="https://i.stack.imgur.com/IhhUn.png" rel="nofollow noreferrer">libvlcsharp popup screenshop</a></p>