I have hardware yoke and throttles...

In FSUIPC what are the appropriate buttons to map to. I have the autopilot disconnect red button on my yoke mapped to AP Master in FSUIPC, however the autothrottle disconnect is giving me problems: A/T Arm button in FSUIPC just switches off the A/T Arm switch in the cockpit, which is not how one switches off the autothrottle in real life (except during an emergency/drift down situation).

What FSUIPC command do I map so that it will "press" the A/T Disconnect button located on the throttles?