public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
var tpl = value as Tuple<bool, string>;
if (tpl.Item1)
return new PicturePreviewView { DataContext = new PreviewImageViewModelWrapper(_imagesService.GetImagesFromUrl("", tpl.Item2), _systemServices) };
else
return null;
}