interactive button or menu or submenu de-activation
unsetmenu(button,[nsub])
unsetmenu(gwin,button,[nsub])
:button a character string. The button name : :gwin integer. The number of graphic window where the button is
installed
:
The function allows the user to deactivate buttons or menus created by addmenu in the main or graphics windows command panels.
`addmenu`_('foo')
unsetmenu('foo')
unsetmenu(`gettext`_("File"), 3)