YUI: Post initialization of an extension

gistfile1.js

YUI.add(
    "ep-data-user",
    function (Y) {
        var DataUser = Y.namespace("EP").DataUser = function (config) {
            //Y.log("DataUser constructor");
            this.after("initializedChange", this.post_initialization, this);
        };  

        //
        // these values should be overridden with defaults in the class
        // using this extension
        //
        DataUser.ATTRS = { 
            data_user_parameters: {
                value: null
            }   
        };  

        DataUser.prototype = { 
            _data_user_data_mgr: null,

            post_initialization: function () {
                Y.log("DataUser::post_initialization");
                Y.log("DataUser::post_initialization - this: " + this);
                Y.log("DataUser::post_initialization - data_user_parameters: " + Y.dump(this.get("data_user_parameters")));


                if (Y.Lang.isValue(this.get("data_user_parameters"))) {
                    // do stuff here...
                }   
            }   
        };  
    },  
    "0.0.1",
    {   
        requires: []
    }   
);