Do auto manufacture warranties transfer when you sell your car?

I'm in the market for a 09' Hyundai Sonata and Carmax as a few on their lot. I also contacted a Hyundai dealer to see what they had in stock and was told that only certified Hyundai's from a Hyundai dealer will only retain the 10yr/100,000 warranty when I mentioned seeing a few at Carmax. Anyone have some experience with this? If it is some kind of gimmick to have me purchase from them, well then it failed.