Car does not hold self on slope

My mother in law just bought a new 2007 Focus. It has about 1000 miles on it right now. She has noticed that it does not hold on a hill. If she stops on a slope the car will roll backwards and it is an automatic. I have never heard of this being normal in any automatic vehicle. So she took it to the local Ford stealer and they told her that new Fords do this. It is some new safety feature. How can this be a safety feature?? Anyone out there with a newer Focus?? I think think they are just telling her a bunch of BS so I am wondering if this is happening to anyone else.
Thanks in advance.

its normal, any cars gonna roll backwords... once in a while it will hold but for the most part it wont.. put your foot in the brake. Problem solved :thinkerg:

I find that hard to believe. I work for a major car rental company and have driven lots of new cars. Not a single one rolled backwards on a hill. This Focus rolls back as if it were a manual tranny with a first time driver. I can't compare her car to any we have at work becuase the company I work for refuses to by Focus' because of all the problems we have with them in the past. Even the Ford dealer said that older an older Focus will hold itself on a hill but the new ones will not because of some new "safety feature"