FINALLY, I got my CEGUI plugin doing what it is supposed to do. Working. After fighting through a swamp of dependencies and input incompatiblities of the acknex engine (btw mous_valid is not updated in the pluging sdk) I managed to got the xml layout and configuration thing running. Was quiet some work to figure out how to bind events to the elements.
Here a screenshot. It is not much, because it is work in progress. And there are a lot of bugs and unsave code I have to remove before I can put some nice demos together.