I have a very complex object, made up of many sub-objects. I can highlight each one, I can turn each one on and off, but whenever I highlight one in the object list, and try to apply a material just to it, it seems, instead, to apply it to the entire set. This object is a model of a snow globe. When I apply it, I just get one huge opaque globe of the applied material. How do I apply materials to each individual object within the 'globe'?