public InnerRegistrationViewModel(INavigationService navigationService)
     : base(navigationService)
 {
     ConfirmCmd = new Command(() => ConfirmAsync(), () => Password.IsValid);
     Password   = new ValidatablePassword(PropChangedCallBack, new PasswordValidator());
 }
 public LoginViewModel(INavigationService navigationService)
     : base(navigationService)
 {
     Password = new ValidatablePassword(null, new PasswordValidator());
     Points   = new ObservableCollection <View>();
 }