How do I reinstate the ribbon to its original position in CAD 2009

[johncharlespollard]

Hi, I've been using AutoCad 2009 since in was launched and today something strange happened. I must have hit a button by mistake and the ribbon "un-docked" from the top of the screen. now I can't make it go back. I have tried right clicking on the ribbon but both the options "size" and "move" are showing grey and don't allow me to select them. Also i beive that normally you can just drag it into position, but it won't let me do that either. Any ideas?

[jaberwok]

Hold the "ctrl" key, right-click the header, check "allow docking", uncheck "anchor ...".
Hold the "ctrl" key, right-click the header and start to drag, release the "ctrl" key, finish drag into position.

Works for me, anyway.