protected void Page_Init(object sender, EventArgs e)
         {
             ComboBox cmbTest = new ComboBox();
             cmbTest.ID = "cmbTest";
             InitBooleanDrop(cmbTest);
             cmbTest.DirectSelect += new ComponentDirectEvent.DirectEventHandler(cmbTest_DirectSelect);
             this.Page.Controls.Add(cmbTest);
        }

         private void InitBooleanDrop(ComboBox cmb)
         {
             ListItem item = new ListItem();
             item.Text = "---请选择---";
             item.Value = "0";
             cmb.Items.Add(item);
             item = new ListItem();
             item.Text = "Y";
             item.Value = "1";
             cmb.Items.Add(item);
             item = new ListItem();
             item.Text = "N";
             item.Value = "2";
             cmb.Items.Add(item);
             cmb.SelectedItem.Text = cmb.Items[0].Text;
         }

           //不能取得选择的值
        void cmbTest_DirectSelect(object sender, DirectEventArgs e)
         {
             ComboBox cmb = (ComboBox)sender;
             X.Msg.Alert(cmb.SelectedItem.Text, cmb.SelectedItem.Value).Show();
         }

this.Page.Controls.Add(cmbTest);

this.form1.Controls.Add(cmbTest);

http://forums.ext.net/showthread.php?13114&p=54033&viewfull=1#post54033

Visible and Hidden are not the same.
 If Visible=false then a widget is not rendered at all (it is absent on client side) therefore we cannot change visibility on client side. 
You have to rerender the widget after set Visible=true during DirectEvent

 
Widget1.Render();
 
If Hidden=true then the widget is rendered but hidden in the browser, you can easly to control visiblilty in the client side by Hidden 
property during DirectEvent 

“/”应用程序中的服务器错误。
--------------------------------------------------------------------------------


Token is not unique
-------------------
ID = _ClientInit
TagName = anchor
Match = <#:anchor id="_ClientInit" />
 
 说明: 执行当前 Web 请求期间，出现未处理的异常。请检查堆栈跟踪信息，以了解有关该错误以及代码中导致错误的出处的详细信息。 

 异常详细信息: Transformer.NET.TokenNotUniqueException: Token is not unique
-------------------
ID = _ClientInit
TagName = anchor
Match = <#:anchor id="_ClientInit" />


源错误: 


执行当前 Web 请求期间生成了未处理的异常。可以使用下面的异常堆栈跟踪信息确定有关异常原因和发生位置的信息。  

堆栈跟踪: 



[TokenNotUniqueException: Token is not unique
-------------------
ID = _ClientInit
TagName = anchor
Match = <#:anchor id="_ClientInit" />
]
   Transformer.NET.Token.ParseAnchors() +508
   Transformer.NET.TextTransformer.Parse(List`1 tokensType, Dictionary`2 variables) +1063
   Transformer.NET.TextTransformer.Transform(List`1 tokensType, Dictionary`2 variables) +42
   Transformer.NET.TextTransformer.Transform(List`1 tokensType) +41
   Transformer.NET.TextTransformer.Transform() +53
   Ext.Net.ExtNetTransformer.Transform(String text) +210
   Ext.Net.InitScriptFilter.Transform() +50
   Ext.Net.InitScriptFilter.Flush() +74
   System.Web.HttpWriter.Filter(Boolean finalFiltering) +8782518
   System.Web.HttpResponse.FilterOutput() +82
   System.Web.CallFilterExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +47
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +75

View Code

protected override void CreateChildControls()
{
　　Viewport viewMain = new Viewport();
　　viewMain.ID = this.ID + "_viewMain";
　　viewMain.Layout = "AnchorLayout";
　　viewMain.AutoScroll = true;
　　viewMain.Border = false;
　　viewMain.BorderSpec = "0 0 0 0";

　　this.Controls.Add(viewMain);  //少了这条语句就会出现上述错误提示
}

public class TextFieldState : Ext.Net.Panel
    {
        private TextField referText;
        private Ext.Net.Panel referPanel;

        private string _text;
        private string _selectText;

        public virtual string Text
        {
            get
            {
                _text = ViewState["Text"].ToString();
                return _text;
            }
            set
            {
                _text = value;
                ViewState["Text"] = _text;
                if (referText != null)
                    referText.Text = _text;
            }
        }
        [Bindable(true)]
        [Localizable(true)]
        public string SelectText
        {
            get
            {
                _selectText = ViewState["SelectText"].ToString();
                return _selectText;
            }
            set
            {
                _selectText = value;
                ViewState["SelectText"] = _selectText;
            }
}

<ext:ResourceManager ID="ResourceManager1" runat="server" DisableViewState="false" />  //页面中需要更新属性DisableViewState="false"

public partial class WebForm4 : System.Web.UI.Page
    {
        protected TextFieldState txtFState;

        protected void Page_Init(object sender, EventArgs e)
        {
            txtFState = new TextFieldState();
            txtFState.ID = "txtFState";
            
            this.form1.Controls.Add(txtFState);
            
            Ext.Net.Button btn = new Ext.Net.Button();
            btn.Text = "Set";
            btn.DirectEvents.Click.ViewStateMode = ViewStateMode.Enabled; //必须启用ViewState
            btn.DirectClick += new Ext.Net.ComponentDirectEvent.DirectEventHandler(btnSet_DirectClick);
            this.form1.Controls.Add(btn);

            btn = new Ext.Net.Button();
            btn.Text = "Show";
　　　　　　　　//必须启用ViewState
            btn.DirectEvents.Click.ViewStateMode = ViewStateMode.Enabled;
            btn.DirectClick += new Ext.Net.ComponentDirectEvent.DirectEventHandler(btn_DirectClick);
            btn.EnableViewState = true;
            this.form1.Controls.Add(btn);
        }

        void btnSet_DirectClick(object sender, Ext.Net.DirectEventArgs e)
        {
            txtFState.Text = "ddddfdfd";
            txtFState.SelectText = "aaaaaa";
        }

        void btn_DirectClick(object sender, Ext.Net.DirectEventArgs e)
        {            
            X.Msg.Alert("提示", txtFState.Text + "|" + txtFState.SelectText).Show();
        }
    }

ButtonID.DirectEvents.Click.IsUpload = true;

App.direct.ExportData({ isUpload: true });