title: Template in between items
body: <p>I have a collection of items and want to show it in a <code>ListView</code> as a List of comma separated values. How can I show a comma in between the values?</p>
  
  <p>So far I've created a <code>ItemsPanelTemplate</code> with a <code>&lt;VirtualizingStackPanel IsItemsHost="True" Orientation="Horizontal"/&gt;</code> as only child.</p>
  
  <p>Obviously creating a <code>DataTemplate</code> which includes the comma would result in a tailing comma, where I don't want one.</p>