If target and arguments fields were weakly copied, fix them here. If they were in the tree being copied, fix them up, otherwise point to the originals!!
Copy all of my instance variables. Some need to be not copied at all, but shared. Warning!! Every instance variable defined in this class must be handled. We must also implement veryDeepFixupWith:. See DeepCopier class comment.
Perform the action of this button. Subclasses may override this method. The default behavior is to send the button's actionSelector to its target object with its arguments.
The receiver finds itself operating in a possibly-different new world. If any of the receiver's parts are world-dependent (such as a target of a SimpleButtonMorph, etc.), then have them adapt accordingly
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.