genericMenu:

getCurrentSelection

noteNewSelection:

perform:orSendTo:

Selector was just chosen from a menu by a user. If can respond, then
perform it on myself. If not, send it to otherTarget, presumably the
editPane from which the menu was invoked.

update:

Receive a change notice from an object of whom the receiver is a
dependent. The default behavior is to do nothing; a subclass might want
to change itself in some way.