How to push/pull A32NX VS knob please

This is the very last thing that I need in my project.

How do I push/pull the VS knob in the AS32NX?

I can do the Speed, Hdg and Alt knobs with

TransmitEvent using SPEED_SHOT_INDEX_SET, ALTITUDE_SLOT_INDEX_SET, and HEADING_SLOT_INDEX_SET

but VS_SLOT_INDEX_SET doesn’t work for me