WPF TreeView 节点双击事件

private void MyTree_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            if(e.ClickCount != 2)
            {
                return;
            }
            if(null!=this.MyTree.SelectedItem)
            {
                var curSel = this.MyTree.SelectedItem as MyTreeNode;
                MessageBox.Show(curSel.name);
            }
        }