XDJ-1000 MK2 - Change HID controlled deck

Howdy - I have a couple of these XDJ-1000 MK2 and I've been playing with the Rekordbox control ("HID") functionality.

I can get it setup and working with the laptop just fine, but it seems that once I select a deck to control I cannot change the deck. It would be sweet if I could use 2 XDJs to control 4 virtual decks in rekordbox - ya know?

When I select the deck to control, the screen says something like  "press and hold the back button for more than a second to change decks" - but this does not work.

Only way I have found is to power off and on the entire unit - which is just not going to work!

Any one know how to do this?