DirectEvents事件

今天在TreePanel里添加一个点击事件，可是报错在网上找了很久也没有一个靠谱的。最后终于发现用DirectEvents事件必须是Protected才行！

<ext:TreePanel ID="TreePanel1" runat="server" Title="Tree" Width="300" Height="450"
    Border="false" AutoScroll="true">

   
            <DirectEvents>
                <ItemClick OnEvent="NodeSelected"></ItemClick>
                               
            </DirectEvents>
</ext:TreePanel>

      [DirectMethod]
        private void NodeSelected(object sender, DirectEventArgs e)
        {
            List<SubmittedNode> tmpList = TreePanel1.SelectedNodes;
            if (tmpList.Count > 0)
            {
                X.Msg.Alert("OK", "HI").Show();
            }
        }