code: def __initialize_model(self):
          
  
          LOGGER.debug("> Initializing model.")
  
          self.beginResetModel()
          self.root_node = umbra.ui.nodes.DefaultNode(name="InvisibleRootNode")
          self.__default_project_node = ProjectNode(name=self.__default_project,
                                                    parent=self.root_node,
                                                    node_flags=int(Qt.ItemIsEnabled),
                                                    attributes_flags=int(Qt.ItemIsEnabled))
          self.enable_model_triggers(True)
          self.endResetModel()
docs: Initializes the Model.