Draw RichTextBox to JPG

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C#

Hey I have a large panel in Ribbon Application , size of a page and it contains many other controls and a richtextbox. However DrawToBitmap is not working properly for richtextbox. I searched a little but it seems i have to print the screen. But i can't print because the page is a little big.
So is there another way to draw my panel with the richtextbox?

I am using this code.

OuterPages outer=new OuterPages();
Controls.Add(outer.TestPage);
SaveBitmap();
//OuterPage is a class that contaings the panel TesPage and many controls in it //including RichTextBox.
       public void DrawControl(Control control, Bitmap bitmap)
        {
            control.DrawToBitmap(bitmap, control.Bounds);
            foreach (Control childControl in control.Controls)
            {
                DrawControl(childControl, bitmap);
            }
        }

        public void SaveBitmap()
        {
            Rectangle rc = new Rectangle(0, 0, outer.TestPage.Width, outer.TestPage.Height);
            Bitmap bmp = new Bitmap(outer.TestPage.Width, outer.TestPage.Height);
            
            outer.TestPage.DrawToBitmap(bmp, rc);
            foreach (Control control in outer.TestPage.Controls)
            {
                DrawControl(control, bmp);
            }
          //  outer.TitleRichTextBox.DrawToBitmap(bmp, rc);  This is not working.

            bmp.Save("C:\\Users\\Missak\\Desktop\\panel.jpg");
        }