Gtk.Menu.prototype.set_title

function set_title(title:String):void {
    // Gjs wrapper for gtk_menu_set_title()
}

Sets the title string for the menu.

The title is displayed when the menu is shown as a tearoff menu. If title is null, the menu will see if it is attached to a parent menu item, and if so it will try to use the same text as that menu item's label.