Adds a menu item to a previously created menu.
Name must be the same as the name used in cmenu:. Items will be
displayed in the order they are added to the menu. A cmenu can have a
maximum of 25 menu items.
Parameters:
name: The menu name used in cmenu:.
id: A number that specifies the
id of the menu item. cshowmenu: will return this id when the
enter key is
pressed.
text:
A string of the menu item text.