reply(toShouldUnselect:)
Notifies the main application of the preference pane’s ability to be deselected.
Declaration
func reply(toShouldUnselect shouldUnselect: Bool)Discussion
If you override shouldUnselect to return NSPreferencePaneUnselectReply.unselectLater, you must invoke reply(toShouldUnselect:) when you have determined whether or not the preference pane can be deselected.
You should not override this method.