public void Execute(object parameter)
{
var window = _shell as Window;
var targetBitmap = new RenderTargetBitmap(175, 150, 96d, 96d, PixelFormats.Default);
targetBitmap.Render(window);
targetBitmap.Freeze();
var thumbnail = targetBitmap.ToBase64String();
_logger.Info(thumbnail);
}