When I migrated existing VS 2003 projects into VS 2005, I was able to continue to use inheritance of my Framework.Form class in the form I create. So, basically, all my forms contain a line to inherit from Framework.Form. Here is an example:

Public Class XMLConstructor
    Inherits Framework.Form
End Class

But, if I create a new project in VS 2005 and try to do the same, I obtain:

Base class 'Framework.Form' specified for class 'XMLConstructor' cannot be different from the base class 'System.Windows.Forms.Form' of one of its other partial types.

I see a new project created in VS 2005 has designer files under each form but those designer files do not appear for a migrated project. This seems to be related. Anyone knows what I have to fix here to be able to inherit from Framework.Form?