[Moose-dev] mooseentitystate

I am trying to create a cache for an attribute that I introduce in MooseEntityState of FamixType. The following expression: self privateState attributeAt: #authors ifAbsentPut: #myAuthors returns me a symbol #myAuthors instead of evaluating the method myAuthors. myAuthors is a method that I introduce in FamixType as an extension and it returns a Bag. Why is this expression returning a symbol instead of evaluating #myAuthors as a block? thanx Usman P.S: The package can be downloaded here: http://www.squeaksource.com/FamixAuthors