private async Task ExecuteLoadGameCommand()
        {
            if (IsBusy)
                return;

            try
            {
        
                IsBusy = true;

        
                if (game == null)
                {
                    await Task.Run(() =>
                        {
                            game = JsonConvert.DeserializeObject<Game>(FileCache.ReadGameData());
                        });
                }

                Prize = game.Prize;
                OnPropertyChanged("Prize");
            }
            finally
            {
                IsBusy = false;
            }
        }
        private async Task ExecuteLoadQuestCommand()
        {
            if (IsBusy)
                return;

            try
            {
        
                IsBusy = true;
                Settings.QuestDone = false;
                QuestComplete = false;
                if (game == null)
                {
                    await Task.Run(() =>
                        {
                            game = JsonConvert.DeserializeObject<Game>(FileCache.ReadGameData());
                        });
                }
                if (Settings.CurrentQuest >= game.Quests.Count)
                {
                    Settings.GameCompleted = true;
                    GameComplete = true;//trigger game complete
                    ExtraTaskVisible = true;
                    Quest = new Quest { Major = -1, Beacons = new List<Beacon>(), Clue = new Clue { Image = "http://blog.xamarin.com/wp-content/uploads/2014/01/evolve-2014.png", Message = "Congratulations, you have completed the Evolve 2014 Quest!" } };
                    OnPropertyChanged(CompletionDisplayPropertyName);
                    OnPropertyChanged("Beacon1Visible");
                    OnPropertyChanged("Beacon2Visible");
                    OnPropertyChanged("Beacon3Visible");
                    return;
                }


                Quest = game.Quests.FirstOrDefault(p => p.Id == Settings.CurrentQuest);
       
                CheckEndQuest();
                OnPropertyChanged(CompletionDisplayPropertyName);
                OnPropertyChanged("Beacon1Visible");
                OnPropertyChanged("Beacon2Visible");
                OnPropertyChanged("Beacon3Visible");
            }
            finally
            {
                IsBusy = false;
            }
        }