private void ExecuteShowPatientRegistrationMenu()
 {
     if (CurrentViewModel == PatientRegisterViewModel)
     {
         return;
     }
     PatientRegisterViewModel.Initialize();
     CurrentViewModel = PatientRegisterViewModel;
 }
 public SecretaryMenuViewModel(PatientRegisterViewModel patientRegisterViewModel, NotificationMenuViewModel notificationMenuViewModel, ScheduleViewModel scheduleViewModel)
 {
     PatientRegisterViewModel  = patientRegisterViewModel;
     NotificationMenuViewModel = notificationMenuViewModel;
     ScheduleViewModel         = scheduleViewModel;
     MessengerInstance.Register <CurrentUser>(this, message => Secretary = message.User as Secretary);
     ShowPatientRegistrationMenu = new RelayCommand(ExecuteShowPatientRegistrationMenu);
     ShowNotificationsMenu       = new RelayCommand(ExecuteShowNotificationsMenu);
     ShowScheduleMenu            = new RelayCommand(ExecuteShowShowScheduleMenu);
     ExecuteShowPatientRegistrationMenu();
 }