public ImageSource DrawThumbnail(LayerModel layer)
{
var thumbnailRect = new Rect(0, 0, 18, 18);
var visual = new DrawingVisual();
using (var c = visual.RenderOpen())
{
c.DrawImage(ImageUtilities.BitmapToBitmapImage(Resources.mouse), thumbnailRect);
}
var image = new DrawingImage(visual.Drawing);
return image;
}