title: WPF: Can't drop dragged data onto an ItemsControl
body: <p>I have the following XAML:</p>
  
  <pre><code>&lt;DockPanel x:Name="OverViewContainer" AllowDrop="True"&gt;
      &lt;StackPanel Orientation="Horizontal"
                  DockPanel.Dock="Bottom"
                  HorizontalAlignment="Right"&gt;
          &lt;uicommon:Toolbar DataContext="{Binding Commands}" /&gt;
      &lt;/StackPanel&gt;
      &lt;ItemsControl ItemsSource="{Binding DocumentElements}"
                    ItemTemplate="{DynamicResource DocumentElementsItemTemplate}" /&gt;
  &lt;/DockPanel&gt;
  </code></pre>
  
  <p>When I drag data onto this panel, the mouse cursor shows a drop is allowed on all the child items, but on any empty space, the cursor shows that dropping is disabled. If I set <code>AllowDrop</code> to false, I can't drop onto the child items anymore, so the flag DOES have an effect. I would like to drop data into the margins between the items in the <code>ItemsControl</code>. </p>
  
  <p>Any ideas?</p>