Wrapper "steals" my Keyboard and Mousewheel events.

Hi
I have a ui that only contains a "View Holder". In the "View Holder" I place an instance of MyDrawing (Subclass of VisualPart).
The method in the ui class that returns MyDrawing looks like this:

drawing
     ^MyDrawing new

With this setup the MyDrawing controller is able to process Keyboard and Mousewheel events. If I add a Wrapper around MyDrawing the MyDrawing controller no longer receives the Keyboard and Mousewheel
events. The changed implementation of #drawing looks like this:

drawing
     ^Wrapper on: MyDrawing new

Can anybody tell me what I'm missing?
michael