code: def save_controls(self, parameterstep: 'timetools.PeriodConstrArg' = None,
                        simulationstep: 'timetools.PeriodConstrArg' = None,
                        auxfiler: 'Optional[auxfiletools.Auxfiler]' = None):
          
          if auxfiler:
              auxfiler.save(parameterstep, simulationstep)
          for element in printtools.progressbar(self):
              element.model.parameters.save_controls(
                  parameterstep=parameterstep,
                  simulationstep=simulationstep,
                  auxfiler=auxfiler)
docs: Save the control parameters of the |Model| object handled by
          each |Element| object and eventually the ones handled by the
          given |Auxfiler| object.