(reposted because of the newsgroups mess)

I'm building a test app in vb.net.
Due to the lack of rebar support, I decided to temporarily do it with an
inherited panel, one that draws the rebar look.

So I created a panel using the IDE, all fine.

Next I created a class to inherit the panel, doing this:

Public Class PanelEx
   Inherits Panel
   Protected Overrides Sub OnPaint(ByVal e As
System.WinForms.PaintEventArgs)
      MyBase.OnPaint(e)
      ......
      'Boring Drawing Stuff
      ......
   End Sub
End Class

Then I replaced the System.Winforms.Panel with PanelEx on the form code. I
run the project, all works as expected, but if I reopen the form in design
mode, I get:

"An error occured while loading the document. Fix the error, and then try to
load the document again. The error message follows:
Could not create the component 'Panel1' because the type 'PanelEx' could not
be loaded. Please make sure that the assembly that contains the type is
referenced. If this type is a part of your development project, make sure
that the project has been successfully built."

Any hints as to what I'm doing wrong? Is this a bug in Beta1?

Best Regards,

Miguel Santos