Problem Importing control in ASP.Net 2.0

[MNA]

Hi,
I am using ASP.Net 2.0 Beta 2.
I have a class which inherits from "System.Web.UI.WebControls.Label" class.
I have added that class in a Web User Control. Now in design mode of that
control I
can see the label but when I drop the control on a web form it shows an error
"An unhandled exception has occured Unknown Server tag cc1:BaseLableTest"
and doesn't render itself properly in design mode.
However when I run it, it works just fine. But it is very hard to develop
anything in design mode because layout is hard to manage. This is something
which was working perfectly in framework 1.1

Any help would be highly appreciated.

The code for control and base class is shown below.

Public Class BaseLabelTest
Inherits Label
End Class


Control.ascx:
<%@ Control Language="VB" AutoEventWireup="false"
CodeFile="tControl.ascx.vb" Inherits="tControl" %>
<%@ Register Assembly="gControl" Namespace="MyControlLib.WebControls"
TagPrefix="cc1" %>

<cc1:BaseLabelTest ID="BaseLabelTest1"
runat="server">Hello</cc1:BaseLabelTest>