public UploadProgramLoginViewModel()
{
LoginCommand = new RelayCommand(LoginAction);
ForgottenCommand = new RelayCommand(ForgottenAction);
RegisterCommand = new RelayCommand(RegisterAction);
Messenger.Default.Register<GenericMessage<CatrobatContextBase>>(this,
ViewModelMessagingToken.ContextListener, ContextChangedAction);
NavigationCallback = navigationCallback;
}