HELP PLEASEEEEEEEEEE

Hi every one:I am trying to make a litle update to the 747 xml gauges:mi intention is that when in the autopilot NAV, APR or BC the text VOR/LOC appers, the question is that NAV 1 must no be drive by GPS (in which case if true L-NAV appers and this part is ready)So caming back if NAV (driven by NAV1), or APR or BC are selected in the autopilot the text VOR/LOC appears; following some of the few know i have I made this code: (A:GPS DRIVES NAV1,bool) 0 ==(A:AUTOPILOT NAV1 LOCK, bool) (*OR*) (A:AUTOPILOT APPROACH HOLD)VOR/LOCBut I does not workCan any body tell my what i am doing wrongThanks a lot for everything