MapPageViewModel.cs

  public class MapPageViewModel : INotifyPropertyChanged
  {
    public MapPageViewModel()
    {
      var _stateMachine = new StateMachine<XUberState, XUberTrigger>(XUberState.Initial);

      _stateMachine.Configure(XUberState.Initial)
          .OnEntry(Initialize)
          .OnExit(() => { Places = new ObservableCollection<GooglePlaceAutoCompletePrediction>(RecentPlaces); })
          .OnActivateAsync(GetActualUserLocation)
          .Permit(XUberTrigger.ChooseDestination, XUberState.SearchingDestination)
          .Permit(XUberTrigger.CalculateRoute, XUberState.CalculatingRoute); 

          ...
     }      
 }