Ax controls in VS 2008( and VS 2005) .NET Web Application

Question

I am trying to add my Ax controls to a .NET Web form. But, the controls are grayed out in the Toolbox ( after I add them using "Choose Items" and selecting from the COM tab). So, I started thinking may be this Ax cotrol can be added onto a WinForms app and not a Web form. But, what confuses me is that I was able to do it using VS 2003. I cant seem to do it in either VS 2005 or VS 2008. Any ideas? Thanks