docs: function (that, methodName, superMembers) {
          var superProto = this._extend.prototype,
              $super = _gpfClassSuperCreate(superProto[methodName]);
          superMembers.forEach(function (memberName) {
              $super[memberName] = _gpfClassSuperCreateMember(that, $super, superProto[memberName]);
          });
          return $super;
      }