Pull-down and Slide-off Menus
Pull-down (see
pull-down menu) and
slide-off menus (see
slide-off menu) consist of a menu button that, when selected, displays a submenu of items. These items can be of any menu type, including another pull-down or slide‑off menu.
Note: You cannot place a slide-off menu directly on the menu bar. All menu bar buttons must be pull-down menus to display the menu below the menu bar.