The error is: The ApplicationBasePage could not be located. Please rebuild project.

I am using a SF Webform and it was working at one point but not now. I can go in the source view and manually type it in so it's not a show stopper but would be nice to use the properties window.

Also, could you post the @page directives from the .aspx page?  The one(s) that include the Inherits="", CodeFile="", or CodeBehind="" are the one(s) that I'm looking for.

http://forum.strataframe.net/FindPost12630.aspx should contain the Extensibility DLL with the changes.  Let me know.