reflective faces

hello all, i think this is more of a modelling question but im not sure... in the racing mod i see theres a tower that has reflective windows like what happens when you load a model with no texture, i tried just leaving faces on a model of mine un textured when i loaded it to torque and they show up grey, so what im wondering is how you get the reflective effect on parts of a model that has a texture... i use milkshape incase that has anything to do with it