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.
Answer the menu for this text view, supplying an empty menu to be filled in. If the menu selector takes an extra argument, pass in the current state of the shift key.
Return true if the receiver wishes to accept the given morph, which is being dropped by a hand in response to the given event. The default implementation returns false.
NOTE: the event is assumed to be in global (world) coordinates.