Vista w/ vs2005 & Ajax

Is there anyway to allow ajax tag prefixes as asp without having designer errors when declared in web.config or page? I'm running as administrator and have sp1 (kb926601) and the vista patch (kb932232) installed

ex:
no errors in designer:
<%@dotnet.itags.org. Register Assembly="System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" Namespace="System.Web.UI" TagPrefix="ajax" %>

causes errors in designer:
<%@dotnet.itags.org. Register Assembly="System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" Namespace="System.Web.UI" TagPrefix="asp" %>

Hi,

As far as I know, the ajax extension has a tagprefix "asp" by default, so it's not necessary to specify it.

And I also tried both, they all work fine.