How to Draw AjaxControlToolkit TabPanel to Bitmap

hi Members,

I have ajax tab container that contains many tabs. I want to loop through each tab and draw the tab panel content to bitmap.

This is my current codes:

foreach (object obj in container.Controls)
                {
                    if (obj is AjaxControlToolkit.TabPanel)
                    {
                        AjaxControlToolkit.TabPanel tabPanel = (AjaxControlToolkit.TabPanel)obj;

                        Bitmap m_Bitmap = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height);

                        Graphics graphics = Graphics.FromImage(m_Bitmap as System.Drawing.Image);
                        graphics.CopyFromScreen(25, 25, 25, 25, m_Bitmap.Size);

                        m_Bitmap.Save(@"C:\Users\user\Desktop\Project\Project1\Source Code\Project1\Image\" + tabPanel.HeaderText + ".jpg", System.Drawing.Imaging.ImageFormat.Jpeg);
                    }
                }

Now I am able to loop thorugh each tab panel in the tab container and screenshot the whole webpage, then save the bitmap image in Image folder. But I want to screenshot/bitmap just the tab panel content.

Question: How to Draw AjaxControlToolkit TabPanel to Bitmap with my current codes?

Please guide me on this, thanks.