I don't get it then. The D7000 has a dedicated AE-L/AF-L button that can be reprogrammed as an AF-On button, or for various combined and separate AE-L and AF-L modes (or for a flash lock). So Nikon has left the AF-On button for programming, and left pros to fiddle with configs instead of keeping a dedicated AE-L/AF-L button. IMO, that's needlessly dumb.
Then again, with the camera so loaded with enhanced video features and another/second scroller on the back, the designers may have simply run out of room for a dedicated AE-L/AF-L button. I'm not impressed with the decision.