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At this point, the revised application has a menu bar, a menu, and two menu items, but clicking on those display elements has no effect.
To put function behind your menu bar, menu, and menu items, you define the
callback methods identified in appendItem:selector: messages. For
example, you define the resetListBox method to create an instance
of the FileDialog class, which ultimately enables a new value to
be assigned to the foodList variable of the view manager.