The apexi power FC has its only boost control Kit to adjust the amount of boost you wish to run, but to use this on fc hand commander you need to buy the apexi boost control kit (eg: solonide kit) to be able to contol boost through the hand commander.
Or you can buy the AVC-R which is around $700 - This also uses the same solonide (apexi boost control kit) as the Power FC just the avc-r alows you to use more settings eg: start duty, f/b speed, rpm based boost etc. Just extra little functions that you cannot use on the FC commander.
Take a look at the apexi usa site: http://www.apexi-usa.com/electronics.asp
Hope that helps,