A menu bar is a collection of menus accessible from the top of a frame. Selecting a title pulls down a menu; selecting a menu item calls the frame's on-menu-command method with the selected item's id.
For information about special ``Help'' menus, see append in wx:menu-bar%.
Creates an empty menu bar.
Creates a menu bar with the given menus and menu titles. (The length of menus must be the same as the length of titles, otherwise an error is signalled.)