docs: def paste_action_callback(self, *event):
          """Callback method for paste action"""
          if react_to_event(self.view, self.tree_view, event):
              sm_selection, _ = self.get_state_machine_selection()
              # only list specific elements are cut by widget
              if len(sm_selection.states) == 1:
                  global_clipboard.paste(sm_selection.get_selected_state(), limited=['states', 'transitions', 'data_flows'])
              else:
                  logger.warning("Please select only one state to paste.")
              return True