Automatic Transmission Problems of Mercedes Benz GL450

I purchased a brand new 2011 Mercedes Benz Gl450 4matic last night. The car has a keyless go system. When I was pulling into my driveway with my kids in the car this afternoon I accidentally turned the car off without putting the car in park and began to exit the vehicle. I noticed the car started to roll back down my driveway. The car never went into park when I turned it off. Rather it went into neutral. I have never driven a car that didn't go into a park mode when the engine was terminated. Thank goodness a child wasn't playing in my driveway or my dog was there. A car of this sophistication, technology and price should have shifted into the park mode, not the neutral mode when the engine was turned off even if the car wasn't put in park. Additionally, of that is how the car works, then I would think there would be a safety switch n the driver's seat that would disengage the gear when I went to get out of the car. I am truly concerned for the safety of others as well as parked cars with what I believe to be a major design flaw.

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