def menu_bar(self):
        d = self.declaration.menu_bar()
        if d is not None:
            return d.proxy.widget
Allow all specs belonging to header instance to be overwritable.
dataset/ETHPy150Open nucleic/enaml/enaml/qt/qt_main_window.py/QtMainWindow.menu_bar--crossover with--dataset/ETHPy150Open grantbrown/laspy/laspy/header.py/HeaderManager.allow_all_overwritables