title: How to avoid lag while expanding a custom ListViewItem in Windows Phone 8.1?
body: <p>I've created a ListView with custom ListViewItems which will expand if you click/tap on them. This works with two different ContentTemplates. One for the standard item and one for the expanded.</p>
  
  <p>If there are about 5 items in the ListView, the <em>RepositionThemeTransition</em> I'm using on the ListView stutters while expanding an item. I already found out the problem, but I can't solve it.
  The custom ListViewItem's content gets arranged in a Grid and the 2nd column uses StarSizing. If I use a fixed value like 300 px there is no lag and everything works as expected. But with the lag the ListView seems to get a smaller width while expanding and then again the original width after the transition.</p>
  
  <pre><code>&lt;Grid.ColumnDefinitions&gt;
       &lt;ColumnDefinition Width="Auto"/&gt;
       &lt;ColumnDefinition Width="*"/&gt;
       &lt;ColumnDefinition Width="Auto"/&gt;
  &lt;/Grid.ColumnDefinitions&gt;
  &lt;Grid.RowDefinitions&gt;
       &lt;RowDefinition Height="Auto"/&gt;
       &lt;RowDefinition Height="*"/&gt;
  &lt;/Grid.RowDefinitions&gt;
  </code></pre>