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CLR_BUTTON()
   Clears a button from the specified menu.

   Syntax
         nButtonCleared = CLR_BUTTON(nMenuNum,nButtonNum)

   Arguments
         nMenuNum    Sets the number of the menu in which that button
                     resides.
         nButtonNum  Sets the number of the button to remove from the menu.

   Returns
         nButtonCleared Returns the number of the button cleared.
                        (0 returned if not found).

   Description
         To remove a button from the specified menu, pass the button number to
         CLR_BUTTON(). The button will be cleared from the menu and its place
         made available for subsequent calls to BUTTON_ADD() or MENU_ITEM().