private void FillRouteSource()
 {
     if (CurStation.Name == AllStations.First().Name)
     {
         ComboBoxRoutes.ItemsSource = AllRoutes.Concat(Db.Routes.Items);
     }
     else
     {
         StationSelect();
     }
 }
 private void StationSelect()
 {
     ComboBoxRoutes.ItemsSource = AllRoutes.Concat(Db.Routes.Items.Where(r =>
                                                                         r.Stations.FirstOrDefault(s => s.StationId == CurStation.Id) != null));
 }