Steve, the activity custom LCD commands are re-grouped by device priority. On the 6xx series, the device in the left column has top priority. The next device (in the next column from left to right) has 2nd priority and so on. On the 880, it seems the device priority order is: Master Activity Device, Sound device, Display Device. For more details on the 880 priority order see: [Link: remotecentral.com]

Workaround 1: If you need a command from a lower priority device to be grouped with the ones from a top priority device, simply add a "bogus" (a do nothing) command in the top priority column along the same row (line).

Workaround 2: Teach the command to the top priority device.