Airport ground features

Can anyone tell me why when I pull up to the gate in any of the planes, the walkway and service vehicles don't come out to replenish the plane. The front docking system will even say okay and I will put my parking brake on and open the main door, but still nothing will happen. These are all features that are meant to come standard with airport 2002 which I have installed. I am also missing the sub-menu under option/FSNAT. Can someone please help me.. 
