在Telerik for silverlight控件radtreeview中如何选中先后、兄弟、父母节点

radTreeView_SelectionChanged事件可以选中item时触发

private void radTreeView_SelectionChanged( object sender,Telerik.Windows.Controls.SelectionChangedEventArgs e )
{
   // Get a reference to the treeview
   Telerik.Windows.Controls.RadTreeView treeView = sender as Telerik.Windows.Controls.RadTreeView;
   // Get the currently selected items
   ObservableCollection<Object> selectedItems = treeView.SelectedItems;
   RadTreeViewItem item = selectedItems[ 0 ] as RadTreeViewItem;
   // Get the prevIoUs item and the prevIoUs sibling item
   RadTreeViewItem prevIoUsItem = item.PrevIoUsItem;//先节点，当前节点的（方向上）的先节点
   RadTreeViewItem prevIoUsSiblingItem = item.PrevIoUsSiblingItem;//兄弟节点中的先节点

   // Get the next item and the next sibling item
   RadTreeViewItem nextItem = item.NextItem;//后节点，当前节点的（方向上）的后节点
   RadTreeViewItem nextSiblingItem = item.NextSiblingItem;//兄弟节点中的后节点

   // Get the parent item and the root item
   RadTreeViewItem parentItem = item.ParentItem;//当前节点的父母节点
   RadTreeViewItem rootItem = item.RootItem;//当前节点的根节点
}