private static void ClearItem(PivotItem item)
{
if (item.Content is ScalingGifView)
{
((ScalingGifView)item.Content).ImageSource = null;
}
else if (item.Content is ScalingPictureView)
{
((ScalingPictureView)item.Content).ImageSource = null;
}
item.Content = null;
}