Return true if I want to receive mouseEnterDragging: and mouseLeaveDragging: when the hand drags something over me (button up or button down), or when the mouse button is down but there is no mouseDown recipient. The default response is false, except if you have added sensitivity to mouseEnterLaden: or mouseLeaveLaden:, using the on:send:to: mechanism.
Handle a mouseEnter event, meaning the mouse just entered my bounds with no button pressed. The default response is to let my eventHandler, if any, handle it.
Handle a mouseLeave event, meaning the mouse just left my bounds with no button pressed. The default response is to let my eventHandler, if any, handle it.
Add morph-specific items to the given menu which was invoked by the given hand. This method provides is invoked both from the halo-menu and from the control-menu regimes.