//public ObservableCollection<Receivable> Receivables { get; set; }
 public override async void OnNavigatedTo(INavigationParameters parameters)
 {
     Receivables = new ObservableCollection <Receivable>();
     foreach (var item in await _receivableService.GetAssignedReceivablesAsync(_settingsService.AuthAccessToken, false))
     {
         Receivables.Add(item);
     }
     ReceivableHistories = new ObservableCollection <Receivable>();
     foreach (var item in await _receivableService.GetAssignedReceivablesAsync(_settingsService.AuthAccessToken, true))
     {
         ReceivableHistories.Add(item);
     }
     base.OnNavigatedTo(parameters);
 }
        public override async void OnNavigatedTo(INavigationParameters parameters)
        {
            List <int> receivableIdList;

            if (parameters.ContainsKey("receivableIdList"))
            {
                receivableIdList = parameters.GetValue <List <int> >("receivableIdList");
                ReceivableIdList = receivableIdList;
            }
            var collection = await _receivableService.GetAssignedReceivablesAsync(_settingsService.AuthAccessToken, ReceivableIdList);

            Receivables = new ObservableCollection <Receivable>();
            foreach (var item in collection)
            {
                Receivables.Add(item);
            }
            base.OnNavigatedTo(parameters);
        }