Let me start by saying that I am not an expert (only been using DVDRMP myself for about 6 weeks), so one of the experts may give you better advice.

I suggest, though, that if you look at the PGC in the Program Chains section of the last Video Title Set to play and examine the Post Commands, it may well give you clue as to the action needed. It could include a call to the Video Manager menus section which needs to be different for what you want it to do.

Best of luck - I find this software to be very difficult to use, but when you have some idea it does the job.