public async Task LoadMore(SearchInstance instance, Rating rating, ResultSize resultSize)
 {
     var imagesToAdd = await Search(instance.Query, rating, resultSize, instance.Images.Count + 1);
     foreach (var image in imagesToAdd)
     {
         instance.Images.Add(image);
     }
 }
 public Task LoadMore(SearchInstance instance, Rating rating, ResultSize resultSize)
 {
     return Task.Run(() => { });
 }
 public UpdateTileImageCollectionMessage(SearchInstance instance)
 {
     Instance = instance;
 }