private void PhotoMosaicButtonViewModel_RetrieveRequested(object sender, PhotoMosaicButtonViewModelRetrieveEventArgs e)
        {
            var photoMosaicButtonViewModel = sender as PhotoMosaicButtonViewModel;

            if (photoMosaicButtonViewModel != null)
            {
                photoMosaicButtonViewModel.IsEnabled = false;
            }

            AddPhotoSet();
        }
        private void PhotoMosaicButtonViewModel_RetrieveRequested(object sender, PhotoMosaicButtonViewModelRetrieveEventArgs e)
        {
            (sender as PhotoMosaicButtonViewModel).IsEnabled = false;

            AddPhotoSet();
        }
        private void PhotoMosaicButtonViewModel_RetrieveRequested(object sender, PhotoMosaicButtonViewModelRetrieveEventArgs e)
        {
            (sender as PhotoMosaicButtonViewModel).IsEnabled = false;

            AddPhotoSet();
        }