async private void pictureList_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
ImageItem i = (ImageItem)pictureList.SelectedItem;
WriteableBitmap bitmap = await i.GetPictureAsync();
double TargetHeight = this.ActualHeight - 20;
double TargetWidth = this.ActualWidth - 20;
imgSelectedImage.Height = TargetHeight;
imgSelectedImage.Width = TargetWidth;
imgSelectedImage.Source = bitmap;
}
