How to create new lights for scenery in FS9?

I'm using Autodesk VIZ 4 and gmax to create custom scenery for FS9. What I haven't been able to figure out is how to add lights to the buildings. With FS2k4 Pro you only had to use the correct tag on the material assigned to the object you were using for the "light". I've read the documentation that came with the gmax SDK (i.e. attach tool) but can't figure out how to add an "empty" to create a new light. Any help or pointers would be most appreciated, and I hope I can repair the favor.