MenuItem* add_submenu(const std::string& text, Menu* submenu, int id = -1);
MenuItem* add_controlfield(int id, const std::string& text,
const std::string& mapping = "");
MenuItem* add_submenu(const std::string& text, Menu* submenu, int id = -1);
MenuItem* add_controlfield(int id, const std::string& text,
const std::string& mapping = "");