docs: def remove_action_callback(self, *event):
          """Callback method for remove action
  
          The method checks whether a shortcut ('Delete') is in the gui config model which shadow the delete functionality
          of maybe active a entry widget. If a entry widget is active the remove callback return with None.
          """
          if react_to_event(self.view, self.tree_view, event) and \
                  not (self.active_entry_widget and not is_event_of_key_string(event, 'Delete')):
              self.on_remove(None)
              return True