Menu Classes
- MenuBar: The top-level menu that runs horizontally underneath the application's TitleBar. In most cases, the menu creates MenuPopDowns when the user selects a top-level item.
- MenuPopDown: A list of menu choices displayed vertically, both for the popdown directly underneath the top level choices, and for any deeper menu levels. Deeper menus are indicated by a -> symbol to the right of the menu item, and the menu pops to the right. The maximum menu depth is three: one MenuBar, and two MenuPopDowns.