Pilot keyed to lights

I have had no luck getting a pilot to appear and disappear depending upon lights.
Anyone done this?
Step-by-step dummies guide please, for GMAX.
I figured all I had to do was place the LIGHT_NAV or LIGHT_LAND object at the top of the pilot's hirearchy but er, there doesn't seem to be a light object as such, just materials and both my animated (TICK18) and non-animated pilots showed up no matter what I did.
Model is fantastic apart from this. :-/
Kev
Anyone done this?
Step-by-step dummies guide please, for GMAX.
I figured all I had to do was place the LIGHT_NAV or LIGHT_LAND object at the top of the pilot's hirearchy but er, there doesn't seem to be a light object as such, just materials and both my animated (TICK18) and non-animated pilots showed up no matter what I did.
Model is fantastic apart from this. :-/
Kev