How can I replace the root component in the design?

I also had the same problem, but currently is quite difficult to implement a solution! An possible "hack" is to change the Decorator name directly in Mongo and reload the Prototype, but is of course not a clean solution. Probably the esasiest solution is to do exaclty the same thing programmatically (for the root only); I can show a popup with other possible Containers; take the type and directly change the value in the MongoDB and reload it. I will give a try...

I did it! Without hacking the MongoDB as I mentioned, but simply by manipulating the references; I will release it with 2.2.