title: VerticalScrollBar for a listbox inside an Expander - WPF
body: <p>I'm working on a WPF application. I have a listbox inside an Expander, and what I want to do is for the list box to have a vertical scroll bar. Here is my code:</p>
  
  <pre><code>&lt;Expander Grid.Row="1" Header="More Details" &gt;
      &lt;ListBox ScrollViewer.VerticalScrollBarVisibility="Visible" 
               Height="20"
               ItemsSource="{Binding Path=DetailsItemsSource, Mode=TwoWay}" 
               ItemTemplate="{Binding Path=DetailsTemplate, Mode=TwoWay}"&gt;
      &lt;/ListBox&gt;
  &lt;/Expander&gt;
  </code></pre>
  
  <p>I can see a scrollbar area in the listbox , but no scrollbar itself (even when there are unseen items). Thanks!</p>