Designer cannot create an instance of a class because it is declared as abstract

[Claude]

Hello!

I have a class inheriting from an abstract class. When I click to view the UserControl in the designer, I got the following error (with a white X inside a red circle at the right of the text): "An error occured while loading the document. Fix the error, and then try loading the document again. The error message follows: The designer must create an instance of type ''MyAbstactClass'' but it cannot because the type is declared as abstract." I really need the abstract keyword beacause I got virtual and abstract methods. Is there any way to see the design of the child class in the designer?

Thank you