title: Windows 8 - ListView using Horizontal items panel doesn't scroll
body: <p>I have a <code>ListView</code> and I've simply replaced the <code>ItemsPanel</code> template with a <code>StackPanel</code> that's in horizontal mode, like so:</p>
  
  <pre><code>&lt;ListView.ItemsPanel&gt;
      &lt;ItemsPanelTemplate&gt;
          &lt;VirtualizingStackPanel Orientation="Horizontal" /&gt;
      &lt;/ItemsPanelTemplate&gt;
  &lt;/ListView.ItemsPanel&gt;
  </code></pre>
  
  <p>However the items don't extend beyond the right hand side of the screen and thus, there's effectively no scrolling in any direction.</p>
  
  <p>I copied the code from a //build/ session, so what did I miss?</p>