I'm nesting an instance of the SharedWhiteBoard within another UIComponent in a Flex 4.1 web app, and i'm restricting the left/right/top/bottom of the nested SharedWhiteBoard component to fit a video area. It's working beautifully except for mouse cursor behaviors. While I can only draw/move drawn objects within the restricted area, it seems that the selection tool (crosshairs) is active outside of the component's boundary area, and prohibits the user from clicking other UI elements that I've positioned below the whiteboarding area. My current workaround is to just turn off the visibility of the whiteboard to access the controls, but I'm hoping I'm just overlooking some kind of invalidation call on the SharedWhiteBoard to make it adhere to the boundary areas.