private void xamDataTreeCases_Loaded(object sender, RoutedEventArgs e)
{
	Infragistics.Controls.Menus.XamDataTree tree = (Infragistics.Controls.Menus.XamDataTree)sender;

	// having to set this again to make the collection show up
	tree.ItemsSource = viewModel.CaseCollection;
  
	foreach (Infragistics.Controls.Menus.XamDataTreeNode tn in tree.Nodes)
	{
		if (tn.Data is CaseList)
		{
			foreach (Infragistics.Controls.Menus.XamDataTreeNode cn in tn.Nodes)
			{
				if (cn.Data is UTPFCase)
				{
					UTPFCase c = (UTPFCase)cn.Data;
					if (c.FilePath == Properties.Settings.Default.LastUsedCaseFilePath)
					{
						tn.IsExpanded = true; // expand the parent node
						
						cn.IsActive = true;

						cn.IsSelected = true;
						break;
					}
				}
			}
		}
	}
}