printscreen a panel control

Question

Hi, im doing a paint program and it all works perfectly
except for the save image thingy...
i got this code, but it just saves the control without the graphics i paint on top (with pen):
any ideas? pls?

ImageFormat img; Bitmap bt; Graphics screenShot;

        private void button1_Click(object sender, EventArgs e)

        {

            if (saveFileDialog1.ShowDialog() == DialogResult.OK)

            { 

                

                img = ImageFormat.Jpeg;

                

                bt = new Bitmap(panel1.Width, panel1.Height, PixelFormat.Format16bppGrayScale);

                   

                screenShot = Graphics.FromImage(bt);

                

                screenShot.CopyFromScreen(panel1.Location.X, panel1.Location.Y, panel1.Width, panel1.Height, panel1.Bounds.Size, CopyPixelOperation.SourceCopy);

            }

            bt.Save(saveFileDialog1.FileName, img);

        }