Flex framework includes three controls that present hierarchical data in a cascading menu format. All menu controls can have icons and labels for each menu item, and dispatch events of the mx.events.MenuEvent class in response to user actions. You can use the following menu-based controls:

Menu control 

A visual menu that can have cascading submenus. You typically display a menu control in response to some user action, such as clicking a button. You cannot define a Menu control by using an MXML tag; you must define it, display it, and hide it by using ActionScript.

MenuBar control 

A horizontal bar of menu items. Each item in the menu bar can have a submenu that displays when you click the MenuBar item. The MenuBar control is effectively a static (non-pop-up) menu that displays the top level of the menu as the bar items.

PopUpMenuButton control 

A subclass of the PopUpButton control that displays a Menu control when you click the secondary button. The primary button label changes when you select an item from the pop-up menu.