You haven't said which EHAM scenery you are referring to, so I'm using default. You haven't said anything about which gate you used, so I used two random gates. You haven't said which kind of pushback you chose ( default Left/Right, Quick Pushback or a saved Custom pushback ), so I'm using default. I don't have your 737, so I used the default from FSX.
In that video, you can see that:
- The menu correctly show Abort Pushback and Stop here, which is what is supposed to show when you open GSX when a pushback is in progress.
- BOTH options works as they should, and in the video I made two pushback, one using the "Stop here" method, the other one using the "Abort" method. The difference is the "Stop" method completes the Pushback gracefully, by continuing the procedure to the nromal end, while the "Abort" method immediately stops the process.