title: CheckAndDownloadUpdateAsync doesn't work
body: <p>Can you guys tell me how it should be done? I have out of browser app with a button. The Button does this:</p>
  
  <pre><code>Application.Current.CheckAndDownloadUpdateCompleted
    += (object sender, CheckAndDownloadUpdateCompletedEventArgs e) 
    =&gt; MessageBox.Show(e.UpdateAvailable.ToString());
  
  Application.Current.CheckAndDownloadUpdateAsync();
  </code></pre>
  
  <p>I run the app, add something, rebuild the app, click on the button - it says false.</p>
  
  <p>What could be wrong with that?</p>
  
  <p>UPD: BTW... it's OOB App</p>
  
  <p>UPD2: I tested with Fiddler. It get's the xap, but still doesn't update</p>