docs: def register_actions(self, shortcut_manager):
          """Register callback methods fot triggered actions.
  
          :param rafcon.gui.shortcut_manager.ShortcutManager shortcut_manager: Shortcut Manager Object holding mappings
              between shortcuts and actions.
          """
          shortcut_manager.add_callback_for_action('close', self.on_close_shortcut)
  
          # Call register_action of parent in order to register actions for child controllers
          super(StateMachinesEditorController, self).register_actions(shortcut_manager)