title: Visual defect in VirtualizingStackPanel in FlipView WP 8.1
body: <p>In my project i am working with <code>FlipView</code> with collection of images. For better performance i am using <code>VirtualizingStackPanel</code> and it working fine, but i noticed strange behavior of last item of collection in flipview. If i am scrolling to last item and then scroll back to the previous, last image sometimes disappearing for a moment as though redrawing(flickering). Here is modified flipview sample from <a href="https://code.msdn.microsoft.com/windowsapps/XAML-FlipView-control-0ae45312" rel="nofollow">msdn</a>: <a href="http://1drv.ms/1d2WGzg" rel="nofollow">http://1drv.ms/1d2WGzg</a> . You can try it yourself on first page <code>Scenario1_Population</code>.</p>
  
  <p>Code what i have add to this sample:</p>
  
  <pre><code>&lt;FlipView.ItemsPanel&gt;
      &lt;ItemsPanelTemplate&gt;
           &lt;VirtualizingStackPanel Orientation="Horizontal"/&gt;
      &lt;/ItemsPanelTemplate&gt;
  &lt;/FlipView.ItemsPanel&gt;
  </code></pre>
  
  <p>Has anyone faced this problem before? I will be appreciate for any advice!</p>