그래픽스. 어디에 그려지는가?

DrawRect(  Graphics.FromHwnd( this.pictureBox1.Handle ) , new Pen( Color.Red ,2f), new Rectangle( 1, 1, 10,10));
DrawRect(  Graphics.FromHwnd( this.pictureBox2.Handle ) , new Pen( Color.Blue ,2f), new Rectangle(0, 0, 10,10));

private void DrawRect( Graphics ggg, Pen  pen, Rectangle rect)
{
        ggg.DrawRectangle(pen, rect);
}

Graphics를 테스트 해보면... 해당 컨트롤에서 추출된 Graphics 객체에 그려짐...

2D GDI + 가 궁금할때!!! 테스트해봤던 내용임.
어디에 그려지는가~