RTB to image

i have a panel with multiple richtextbox's within it. i need to render these RTB's to an image or even add the contents to an image of the panel.

how can i achieve this?

i've search the net and found nothing that could help me.

i'm fairly new to C# and vs2010, so any tips would be appriciated.

ps. i've tried rtb.drawToBitmap, but that is not supported.