MultiPage与TabStrip在vs2005中出现的问题 代码如下为什么没法做像选项卡一样的效果谢谢

MultiPage与TabStrip在vs2005中出现的问题 代码如下为什么没法做像选项卡一样的效果谢谢
<%@ Register Assembly="FreeTextBox" Namespace="FreeTextBoxControls" TagPrefix="FTB" %><%@ Register Src="usercontrol/order.ascx" TagName="order" TagPrefix="uc1" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>无标题页</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
      <mytab:TabStrip ID="tsVert" runat="server" TargetID="mpvert">
      <mytab:Tab Text="VB.net" />
      <mytab:TabSeparator />
      <mytab:Tab Text="C#" />
      <mytab:TabSeparator />
      </mytab:TabStrip>
        <mytab:MultiPage ID="mpvert" runat="server">
        <mytab:PageView>
        VB.net
        </mytab:PageView>
        <mytab:PageView>
        c#.net
        </mytab:PageView>
        </mytab:MultiPage>
    
    </div>
       
    </form>
</body>
</html>