setmenu interactive button or menu activation

## Syntax

    setmenu(button [,nsub])
                setmenu(gwin,button [,nsub])

## Arguments

button

  a character string. The button name

gwin

  integer. The number of graphic window where the button is installed

nsub

  integer. The number of submenu to activate (if any). If button has no sub-menu, `nsub` is ignored

## Description

The function allows the user to make active buttons or menus created by `addmenu` in the main or graphics windows command panels.

## Examples

    addmenu('foo')   // New button made in main scilab window
    unsetmenu('foo') // button foo cannot be activated (grey string)
    setmenu('foo')   // button foo can be activated (black string)

## See also

- delmenu
- unsetmenu
- addmenu