I would like to disable horizontal scroll bar in the XamTree control to get a tree view like in MS Outlook (there is no horizontal scroll bar when you minimize the outlook bar in MS Outlook).  The problem is that when I disable it, XamTreeItems get truncated.  ScrollViewer.HorizontalScrollBarVisibility="Hidden" does not work for me because, in this case, when you select a child XamTreeItem, XamTree automatically scrolls to the selected item. 

<Grid x:Name="LayoutRoot" Background="White" Width="400">

   <ig:XamTree x:Name="XamNavigationTree" ScrollViewer.HorizontalScrollBarVisibility="Disabled"/>

</Grid>

private void MainPage_OnLoaded(object sender, RoutedEventArgs e)

{

   for (int i = 0; i < 10; i++)

   {

      XamTreeItem parentItem = new XamTreeItem();

      parentItem.Header = "Parent XamTreeItem with a long header";

      XamNavigationTree.Items.Add(parentItem);

      for (int j = 0; j < 5; j++)

      {

         XamTreeItem child = new XamTreeItem();

         child.Header = "Child XamTreeItem with a long header.Child XamTreeItem with a long header";

         parentItem.Items.Add(child);

      }

    }

 }