Modifying MSFS Panels and Gauges

Hey, I was wondering if there is any tutorials on modifying the current gauge's and panel's in FS2004 (or fs2002). What I would like to do, is modify;ident=RADIO_STACK_PANELgauge01=Bendix_King_Radio!Bendix-King Radio Nav-Comm 1, 0, 29I would like to capture the ACTIVE event, when you set a channel to active. Then do something in or outside the game. Im not sure if this would require a new Nav-Comm Gauge, or if there is a way to edit the current one.I have downloaded all of the 2002 sdk material, DirectX SDK material, and really just need a push in the right direction to get started. Would appreciate any help.