Using Dockable Windows?

http://www.youtube.com/watch?v=BGpDalZriGg

I made that little video to show what im trying to do. I did manage to wrap my windows inside dock widgets, and it works except when I click and make them free floating, then double click to dock them again they dont return to the right spot. What do I need to do to make them go back to their original position?

*Edit*

One other small thing, those groups of icons at the top, what kind of containers are they in? I was assuming they were group box's but I dont know how he got the title along the bottom.