title: Balloon Popup WPF
body: <p>I need to display a baloon popup. Is there a control in WPF for this kind of work?
  Something like the following:</p>
  
  <pre><code>&lt;BalloonPopup&gt;
     &lt;StackPanel&gt;
        &lt;Button/&gt;
        . . .
     &lt;/StackPanel&gt;
  &lt;/BalloonPopup&gt;
  </code></pre>
  
  <p>This is the possible result:</p>
  
  <p><img src="https://i.stack.imgur.com/sk0Ba.png" alt="enter image description here"></p>