Menu Class is really just the menu group of a window. This is not to
be confused with a MenuItem, which corresponds
to the actual menu element the user selects. The Menu can be selected
by itself, but no actions will be performed other than displaying the
MenuItems associated with the Menu. A menu can either be a regular menu
header or a sub-menu header (pop-up).
The Window Declarations include a 'dummy' Menu at
the beginning of the Menu declaration set to distinguish it as a Menu
set to the interpreter.