title: Center a PanoramaItem when selectionchanged
body: <p>I'm noticing that when I swipe through my panorama items it focuses on either the left side or the right side of the panorama item.  (Note: my panoramaitems are slightly wider than default)</p>
  
  <p>How do I center a panorama item when it comes into focus (selectionchanged)?</p>
  
  <hr>
  
  <p>EDIT:</p>
  
  <p>I just did a horrible hack which kind of works but loses the smooth flow:</p>
  
  <pre><code>private void Panorama_SelectionChanged(object sender, SelectionChangedEventArgs e)
  {
    int index = myPivot.SelectedIndex;
    myPivot.DefaultItem = myPivot.Items[index];
  }
  </code></pre>
  
  <p>Is there a better way to do this?</p>