Hi Umberto, this is the sequence that I perfomed the following.
the gate used: H6
the airplane used: Aerosoft A321 professional
the precise, exact, sequence of operation in GSX: press Ctrl + F12 to bring up Chicago O'Hare menu, then press 1 on the menu to start deboarding,
input amount of passengers, the press enter, after pressing the enter button the pushback tug, baggage carts appear for few seconds then the pushback
tug, baggage carts and H6 jetway all disappear.