Correct Push Back Procedures

Hello all,
I would like to know if anyone can help me understand why FSX sometimes automatically turns the plane when (ctrl+p) is pressed for push back? Is ther any way of controlling the direction at all. I have tried using the rudder but all that seems to do is make the plane drift in one direction when pushing back.... it dosent turn?
Regards
Martin
I would like to know if anyone can help me understand why FSX sometimes automatically turns the plane when (ctrl+p) is pressed for push back? Is ther any way of controlling the direction at all. I have tried using the rudder but all that seems to do is make the plane drift in one direction when pushing back.... it dosent turn?
Regards
Martin