add paramet object handl index object paramet todo uml event paramet todo treat object flow state doesn exist anymor uml classifi handl behavior featur illeg argument except handl instanc behavior featur non nl paramet paramet illeg argument except paramet instanc paramet non nl edit domain command stack execut chang command model impl runnabl add command behavior featur handl index paramet paramet add own element owner paramet handl 