public IEnumerable<IResult> SchedulerClosedDaysEdited(object sender, AppointmentEditedEventArgs e)
        {
            AppClosedDay savingAppointment = ((AppClosedDay)e.Appointment);
            if (e.Appointment.IsNotNull()) {
                //SaveBusinessClosedDay
                this.SchedulerIsBusy = true;
                var reqSave = new SaveBusinessClosedDayRequest(savingAppointment);
                yield return reqSave;

                if (reqSave.Error != null) {
                    //this.SchedulerDialogViewModel.Cancel();
                    yield return HandleExceptionResult.Display(reqSave.Error);
                    this.SchedulerIsBusy = false;
                    yield break;
                }
                this.SchedulerClosedDaysEditingId = Guid.Empty;
                this.SchedulerIsBusy = false;
                yield break;
            }
        }
        public IEnumerable<IResult> SchedulerClosedDaysCreated(object sender, AppointmentCreatedEventArgs e)
        {
            AppClosedDay savingAppointment = ((AppClosedDay)e.CreatedAppointment);
            if (savingAppointment.IsNotNull()) {
                //SaveBuisnessClosedDay
                this.SchedulerIsBusy = true;

                // Workaround
                savingAppointment.Start = savingAppointment.IsAllDayEvent ? DateEx.GetStartOfDay(savingAppointment.Start) : savingAppointment.Start;
                savingAppointment.End = savingAppointment.IsAllDayEvent ? DateEx.GetEndOfDay(savingAppointment.End) : savingAppointment.End;

                var reqSave = new SaveBusinessClosedDayRequest(savingAppointment);
                yield return reqSave;
                if (reqSave.Error != null) {
                    yield return HandleExceptionResult.Display(reqSave.Error);
                    this.SchedulerIsBusy = false;
                    yield break;
                }
                savingAppointment.IsNew = false;
                this.SchedulerIsBusy = false;
                yield break;
            }
        }