Repeater 为什么不激发 ItemCommand事件了？

设计了这么一个Repeater：

        <asp:repeater id="Repeater1" runat="server" onitemcommand="Repeater1_ItemCommand" onitemcreated="Repeater1_ItemCreated">
        <headertemplate>
           <table border="1">
           <tr>
            <td>ItemID</td>
            <td>ItemName</td>           
            <td><asp:button id="Button1" runat="server" commandname="Button1" text="Button1" /></td>
           </tr>           
        </headertemplate>
        <itemtemplate>
        <tr>
            <td><%# Eval("ItemID") %></td>
            <td><%# Eval("ItemName") %></td>
            <td><asp:linkbutton id="LinkButton1" runat="server" commandname="LinkButton1" text="LinkButton1" /></td>           
        </tr>
        </itemtemplate>
        <footertemplate>
        </table>
        </footertemplate>
        </asp:repeater>

加载数据：

    public DataTable CreateDataTable( int count)
    {
        DataTable tbl = new DataTable();
        tbl.Columns.Add( "ItemID", typeof(int) );
        tbl.Columns.Add( "ItemName", typeof(string) );            

        DataRow row;  
        int i = count;
        while (i-- > 0)
        {
            row = tbl.NewRow();
            row[0] = i;
            row[1] = "Item#" + i.ToString();
            tbl.Rows.Add( row );
        }

        return tbl;
    }

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            Repeater1.DataSource = CreateDataTable(10);
            Repeater1.DataBind();
        }
    }

Repeate的ItemCreated事件：

    protected void Repeater1_ItemCreated(object sender, RepeaterItemEventArgs e)
    {
        Button btn1 = e.Item.FindControl( "Button1" ) as Button;
        if (btn1 != null)
        {
            // do nothing, just to access the ClientID owing to the button 
            //
            string temp = btn1.ClientID;
        }

        LinkButton lnkbtn1 = e.Item.FindControl( "LinkButton1" ) as LinkButton;
        if (lnkbtn1 != null)
        {
            // do nothing, just to access the ClientID owing to the linkbutton 
            //
            string temp = lnkbtn1.ClientID;
        }
    }

Repeater的ItemCommand事件：

    protected void Repeater1_ItemCommand(object source, RepeaterCommandEventArgs e)
    {
        Response.Write( "CommandName: " + e.CommandName );
    }

运行结果：

Problem：
然而，非常奇怪的是 HeaderTempate里面的Button和ItemTemplate里面的LinkButton都不会激发Repeater的ItemCommand了。
经过多次的尝试，发现，只要在ItemCreated访问了 内嵌的 Control的ClientID，改Control的ClientID就不会改变了，即使父控控件实现了INamingContainer接口。
查看页面生成的HTML源：

<table border="1">
           <tr>
            <td>ItemID</td>
            <td>ItemName</td>           
            <td><input type="submit" name="Button1" value="Button1" id="Button1" /></td>
           </tr>           
        
        <tr>
            <td>9</td>
            <td>Item#9</td>
            <td><a id="LinkButton1" href="javascript:__doPostBack('LinkButton1','')">LinkButton1</a></td>           
        </tr>
        
        <tr>
            <td>8</td>
            <td>Item#8</td>
            <td><a id="LinkButton1" href="javascript:__doPostBack('LinkButton1','')">LinkButton1</a></td>           
        </tr>

注释掉ItemCreated中访问ClientID代码：

    protected void Repeater1_ItemCreated(object sender, RepeaterItemEventArgs e)
    {
        Button btn1 = e.Item.FindControl( "Button1" ) as Button;
        if (btn1 != null)
        {
            // do nothing, just to access the ClientID owing to the button 
            //
            //string temp = btn1.ClientID;  // comment this
        }

        LinkButton lnkbtn1 = e.Item.FindControl( "LinkButton1" ) as LinkButton;
        if (lnkbtn1 != null)
        {
            // do nothing, just to access the ClientID owing to the linkbutton 
            //
            //string temp = lnkbtn1.ClientID;  // comment this
        }
    }

生成的HTML源：

<table border="1">
           <tr>
            <td>ItemID</td>
            <td>ItemName</td>           
            <td><input type="submit" name="Repeater1:_ctl0:Button1" value="Button1" id="Repeater1__ctl0_Button1" /></td>
           </tr>           
        
        <tr>
            <td>9</td>
            <td>Item#9</td>
            <td><a id="Repeater1__ctl1_LinkButton1" href="javascript:__doPostBack('Repeater1$_ctl1$LinkButton1','')">LinkButton1</a></td>           
        </tr>
        
        <tr>
            <td>8</td>
            <td>Item#8</td>
            <td><a id="Repeater1__ctl2_LinkButton1" href="javascript:__doPostBack('Repeater1$_ctl2$LinkButton1','')">LinkButton1</a></td>           
        </tr>

对比一下发现，Button的客户端ID不一样，猜想下原因可能是由于 ClientID不符合NameContainer规则，PostBack以后无法找到事件控件源。
Any Solutions？