on the A320 this works (to push or pull the buttons)
managed
TransmitEvent(EventEnum.SPEED_SLOT_INDEX_SET, 1);
selected
TransmitEvent(EventEnum.SPEED_SLOT_INDEX_SET, 2);
the number is a uint
enum EventEnum {
SPEED_SLOT_INDEX_SET,
HEADING_SLOT_INDEX_SET,
etc.