777 Autothrottle Engage How to?

Hi I'm trying to turn on/off the Autothrottle Engage switch. This is the last tag that is not working for me to complete the autopilot module from GoFligth.This is what I have tried with no success:sMessage.group = 'pFMC'; //sMessage.user.u.datatag = 'athr'; //'pATS';sMessage.user.u.hw = 7;sMessage.intData = 0; //1sMessage.id = MSG_SETDATA;sMessage.dataType = TYPE_INT;Luis Balarin.(Author of FLYIIGF.dll, FLY2LAN.dll)