Main menu
 ----------------------------------------------------------------------------

  The typical structure of a Windows program is to build a Window and to
  assign it a main menu that will be useful as main organizer of the
  application.

  From the menu, the user can select the different tasks of a program.
  Thanks to the pulldown menu structure of Windows we can implement an
  easy and intuitive user interface.

  You should try to use good design techniques for the main
  menu of your application. Don't make it too complicated. The idea is to
  implement just a few main options at the bar menu so the user will easily
  select what he needs, and from there you should presents new submenus that
  will contain all the possible options.

  FiveWin has been designed so you don't need to code DO CASE...ENDCASE
  options to select from the different actions the user may choose.

  When a MenuItem is defined we will specify the action we want to be
  automatically executed when the user selects that option. It is very
  easy to control all the possible options of the program.

    MENU oMenu

       MENUITEM <cItem> MESSAGE <cMessage> ACTION <uAction>

       MENUITEM <cItem> MESSAGE <cMessage> ACTION <uAction>
       MENU
          MENUITEM <cItem> MESSAGE <cMessage> ACTION <uAction>
       ENDMENU
       ...
       SEPARATOR
       MENUITEM <cItem> MESSAGE <cMessage> ACTION <uAction>

    ENDMENU

 MESSAGE & ACTION are optional clauses.  While it is not necessary
 to specify them, they may be desirable.  If an Action clause is not defined,
 then simply nothing happens when you select that menu option.

 You should have as many SubMenus as you need. To create a SubMenu you
 should only have to specify a new declaration MENU ... ENDMENU
 under a MenuItem and complete it as usual.

       MENUITEM <cItem> MESSAGE <cMessage> ACTION <uAction>
       MENU                               // The new Submenu starts here
          MENUITEM <cItem> MESSAGE <cMessage> ACTION <uAction>
          ...
       ENDMENU

       MENUITEM <cItem> MESSAGE <cMessage> ACTION <uAction> // More Items

 To activate the menu:

 To activate the menu first you have to assign it to a Window. The easiest
 way to do it is when we are building our Window:

       DEFINE WINDOW <oWnd> <otherClauses> ;
          MENU BuildMenu()

       ...

       function BuildMenu()

          local oMenu

          MENU oMenu
             MENUITEM <cItem> MESSAGE <cMessage> ...
             ...
          ENDMENU

       return oMenu

 or you can do it later using the command:

       SET MENU OF <oWnd> TO <oMenu>