bind() is already available as f.bind(obj) or Lang.bind(obj, f) (that's why I suggested it in the first place) In any case, you have a bigger problem: you're creating your primary actor inside init(). This is not allowed: init() is just for initialization code, and any serious work should be done in enable(). To help with that, you can return an object from init(), and implement enable() and disable() on that.