Create options menu.

def refresh_actions(self):
        """
        Create options menu.
        """
        self.options_menu.clear()

        # Decide what additional actions to show
        if self.undocked_window is None:
            additional_actions = [MENU_SEPARATOR,
                                  self.undock_action,
                                  self.close_plugin_action]
        else:
            additional_actions = [MENU_SEPARATOR,
                                  self.dock_action]

        # Create actions list
        self.plugin_actions = self.get_plugin_actions() + additional_actions
        add_actions(self.options_menu, self.plugin_actions)