It's a very long time since I've done this and I don't have my game open right now to try it, but if memory serves, I didn't think it was working either because the happiness points didn't change as I was doing the ctrl+clicking. So I left the happiness panel and switched back to showing my Sim's needs. Then later for some reason I was back at the happiness panel, and the points were there! It just seemed to take a while for them to show up. Like I said, it's been a while, but that's how I remember it.