Are VGR Model textures rigged for animation?

I don't want to seem like I'm spamming but I figured a thread would be better for my question.

I just started playing with VGR models today. The rigging on a lot of the models is really handy. I was just wondering. I'm using Maya. I imported the FBX file and the textures, bones and model load perfectly. The models seem to use a single image to work in the character expressions. I see the models have textures for eye transparency and states. You know like eye open, half open, etc.,  (I happen to be working with pokemon models at the moment).


Is there an attribute or driven key on the models that can be changed to easily switch between textured expression states or does that have to be mapped manually every time you want the expression to change? I just wanted to know if I could save myself some work instead of doing that.