title: Background Image of Grid doesn't work
body: <p>I set a background image to my Gird, and it displays correct in the designer, but when I run the app, the image doesn't appear, the background is black, anyone has any ideas? Below is my code.</p>
  
  <pre><code>&lt;Page.Resources&gt;        
      &lt;ImageBrush x:Key="BackgroundImage" ImageSource="People/Images/Background.jpg"/&gt;
  &lt;/Page.Resources&gt;
  &lt;Grid Background="{StaticResource BackgroundImage}"&gt;
  &lt;/Grid&gt;
  </code></pre>