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        void EnableMenuItem(MenuList, MenuNum, ItemNum, SubItemNum, On)


        This routine will enable or disable a MenuItem for you, without you having to
        have the MenuItem's address hard coded into your program.
        It can be used to alter MenuItems in either the drop down or pop up menu
        Give it the Menu list and the three numbers that identify the intended
        MenuItem, and it will find that MenuItem and, depending on the Boolean 'On',
        it will set or clear the ITEMENABLED bit in the MenuItem's Flags.
        If you wish to access a MenuItem that has subitems, set SubItemNum to
        MENUNULL, or -1, and it will update the MenuItem, rather than one of its
        If you are dealing with a Menu that already installed (with SetMenuStrip),
        you can call:

        (*functions->EnableMenuItem)(window->MenuStrip, MenuNum, ItemNum,
                                     SubItemNum, On);


        Window     = Pointer to the linked list of Menu structures
        MenuNum    = Index of Menu to search in.
        ItemNum    = Position in menu of the selected MenuItem.
        SubItemNum = Position in subitem list of MenuItem. If not desired, set this
                     to MENUNULL.
        On         = Boolean flag,
                     TRUE to enable the MenuItem,
                     FALSE to disable it.


        none (void)