[Zope] Calling methods on products

Help! I have a Zcatalog in which I can add actors successfully. I can also add a product for serving sequential tokens. My intent is to use the tokens to id the actors in the actor constructor. My problem is that I don't know how to get the constructor to call the getToken() method on the token generator. I thought container.generator.getToken() should do it but I get a keyError saying non-existent 'generator.getToken'. The generator is subclassed from SimpleItem and also Acquisition.Implicit. Can someone tell me where I'm going wrong? TIA Richard Jennings