Sweep surface newbie question

Hi all,

i saw a video of a reflector created by swept surface. I couldn't manage to draw it. How can i create the surface.

Here is the video

http://www.breault.com/multimedia-gallery.php?ID=215&catTypeID=2&catID=108&page=1&mode=detail

The guy in the video says use the polygon as a guide curve. So basically i need 3 curves for this type of surface. But there are only 2?

Thanks in advance

SolidworksSurfacing