title: Setting background for user control in mainwindow not working
body: <p>I've created a user control called "TestUserControl"</p>
  
  <p>Inside my Mainwindow.xaml file I called my TestUserControl as follows: </p>
  
  <pre><code>&lt;controls:TestUserControl DataContext="{Binding DataContext}" Background="Blue" /&gt;
  </code></pre>
  
  <p>The problem is the blue background isn't being reflected in the actual user control. Is there something I have to do in TestUserControl.xaml to let it accept the data when called from Mainwindow.xaml?</p>
  
  <p>Thanks in advance.</p>