Does your code implement the Constructor? And if so does it call InitializeComponent? I know in forms this is required for the form to render in the designer. I suspect the same is true for components. You can try removing the constructor which should then inherit from the base constructor.
+++ Rick ---
>Jose,
>
>I have a component created from the designer. I make another component and change the inherits line from the base class to my parent class. I get the below message after I have saved the subclass and try to open it again in the designer.
>
>Thanks
>
>Rex
>
>>>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.