A curved bevel effect

Hi, I have made a straight bevel pretty easily, but creating this bevel that has to go through two curves has me stumped. Can anyone figure out how I might do this in Flash? Or if it is impossible, how could I do this short of going into 3DS Max? The crazy thing is, I could probably do it with a pencil and paper in 15 minutes :|. Please see the image for clarification. The red arrow points to the shape I wish to create a bevel on.