Cairo dock wont dissappear down when I move a unmaximized window?

[ontherooftop]

Ok I got everything configured from my compiz settings eye candy to animations on my cairo dock and cairo dock will close and go down when I maximize a window. My problem is when I have a small window and I wobble and move them to the dock, the dock wont disappear and the window looks dumb behind the docks/widgets. I tried many things and clicking on different options in the behaviour section. Could you just give me a heads up on what to do so I can get it done. I got it done on other computers and forget.

[fabounet]

if you use the latest version (2.2), you can select the visibility mode "hide whenever the dock overlaps a window"

[Frogs Hair]

GLX version 2.13 has auto hide but I don't think it has intelligent hide.