title: Show window icon in title bar with MahApps.Metro?
body: <p>I started using MahApps.Metro just yesterday, and I can't figure out how to get application icon to show as window icon on a window (or better, all of them). <a href="http://mahapps.com/guides/quick-start.html" rel="noreferrer">Here</a> in the example window icon is included, but I can't seem to get it. When I use</p>
  
  <pre><code>ShowIconOnTitleBar="True"
  </code></pre>
  
  <p>it doesn't do anything.
  What am I doing wrong?</p>