请问:WebControl 中的toolbar如何用??

<%@ Import Namespace="Microsoft.Web.UI.WebControls" %>
<%@ Register TagPrefix="mytb" 
Namespace="Microsoft.Web.UI.WebControls" 
Assembly="Microsoft.Web.UI.WebControls, Version=1.0.2.226, Culture=neutral, PublicKeyToken=31bf3856ad364e35" %><SCRIPT language="C#" runat="server">
public void ShowClick(Object sender,EventArgs e){
    ToolbarItem btn = (ToolbarItem)sender;
    debug.InnerText += "Clicked on object \"" + sender.ToString() + 
        "\" with index = \"" + myToolbar.Items.FlatIndexOf(btn).ToString()
        + "\" ";
}
private void Page_Load(object sender, System.EventArgs e){
    debug.InnerText ="";
}
</SCRIPT>
<HTML><BODY><FORM runat="server">
<mytb:Toolbar runat="server" id="myToolbar" OnButtonClick="ShowClick" AutoPostBack="true">
    
    <mytb:ToolbarCheckButton id="Mode_Change"
        Tooltip="Change the ToolBar mode"
        ImageUrl="images/tool-dayview.gif"
        Text="Calendar Mode" />
    <mytb:ToolbarSeparator id="Separator_1" />
    <mytb:ToolbarCheckGroup id="Group_A">
        <mytb:ToolbarCheckButton id="Button_A_1" Text="GroupA-1" />
        <mytb:ToolbarCheckButton id="Button_A_2" Text="GroupA-2" />
    </mytb:ToolbarCheckGroup>
    <mytb:ToolbarSeparator id="Separator_2"/>
    <mytb:ToolbarCheckGroup id="Group_B">
        <mytb:ToolbarCheckButton id="Button_B_1" Text="GroupB-1" Selected="True" />
        <mytb:ToolbarCheckButton id="Button_B_2" Text="GroupB-2" />
        <mytb:ToolbarCheckButton id="Button_B_3" Text="GroupB-3" />
    </mytb:ToolbarCheckGroup>
</mytb:Toolbar>
</FORM>
<P>User Input Information:<BR>
<DIV id=debug runat="server"
    style="border:1 solid black;background:beige;width:500;height:50">
</DIV>
</P>
</BODY>
</HTML>