protected override void OnRender(IDrawingContext context, Rect bounds, double opacity)
{
base.OnRender(context, bounds, opacity);
Border border = WpfElement as Border;
DrawingStyle style = DrawingStyle.FromElement(this);
style.CornerRadius = border.CornerRadius;
style.Fill = border.Background;
style.Stroke = border.BorderBrush;
style.StrokeThickness = border.BorderThickness;
style.Opacity = opacity;
context.DrawRect(bounds, style);
if (border.ClipToBounds)
{
context.ClipRect(bounds, border.CornerRadius);
}
}