code: def _show_menu(self):
          
          # If the current widget in the TabbedWindowWidget has a menu,
          # overlay it on the TabbedWindowWidget.
          current_widget = self._tabbed_window.get_current_widget()
          if hasattr(current_widget, 'get_menu_widget'):
              menu_widget = current_widget.get_menu_widget(self._hide_menu)
              overlay = urwid.Overlay(menu_widget, self._tabbed_window,
                                      align='center', width=('relative', 80),
                                      valign='middle', height=('relative', 80))
              self._urwid_loop.widget = overlay
docs: Show the overlay menu.