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

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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)