title: Add an Id to ListBox item
body: <p>I need to add an ID <code>(x:Uid="identifier")</code> to the last and first listbox item. My Listbox items are populated via data-source like this:</p>
  
  <pre><code>&lt;ListBox x:Name="listbox1" Grid.Row="1" BorderThickness="0" 
       ItemsSource="{SomeBinding}"&gt;
  </code></pre>
  
  <p>Could it be done in xaml? </p>