In the dataflash log viewer, how can I view Mavlink messages received by Arducopter?

As title, and is this even possible? I have tried using MAVC.Cmd but it is missing Mavlink command 86 (MAVLINK_MSG_ID_SET_POSITION_TARGET_GLOBAL_INT) that I am sending several times to change the velocity (shown as XKF[0].VE in the graph below):