>I am not trying to drop a component on a document. I am trying to create a subclass in the component designer.
>
>So you are saying that you cannot maintain a component, in the designer, subclassed from an abstract class???
>

Rex:
Now I've lost you. What exactly are you doing? when you say:
"I have an abstract component base class I want to subclass. When I attempt to open the subclass..."

In particular, what do you mean by "open the subclass"

Are you building -in code- a new designer? (directly or indirectly derived from System.ComponentModel.Design.ComponentDesigner)
Or you are building a custom control?

Regards
Jose.