IB plug in for CALayer subclass

I am developing a game with dozens of levels and each level has a unique layer tree with objects that are a subclass of CALayer. I would like to use Interface Builder to set up and layout each level, is it possible to create an IB plug-in for my CALayer subclass which would let me do this? The documentation refer开发者_如何学Cs only to subclasses of views and control; I'd rather not invest the effort of learning about plugins if its not possible.

Thanks, Martin

Unfortunately it is currently not possible to create Interface Builder plugins for your own iPhone user interface elements. (Confirmed by Apple on the Dev Forum)