VStudio and ASP.NET problem/limitation when pages inherit from an Abstract class?

[DesignerX]

The Web form designer can not seem to open and display my .aspx pages which
all inherit from a parent class (which is defined as MustInherit and
inherits from Page.)

The dialog and error message I'm receiving says:

"The file failed to load in the Web Form designer. Please correct the
following error, then load it again: Type Abstract"

Is this a limitation of the IDE? I want to insure that each of the child
pages create certain properties is there a way to do this without using the
MustInherit keyword (creating an abstract class)?

Thank You,
Stan