var sortId:int = _component.sortComboBox.selectedIndex;

        var result:int = 0;
        switch (sortId) {
            case SORT_NAME_ASC:
                result = ShopHelper.comparePurchaseDateAsc(a, b);
                break;
            case SORT_NAME_DESC:
                result = ShopHelper.comparePurchaseDateDesc(a, b);
                break;
            default:
                result = ShopHelper.comparePurchaseDateAsc(a, b);
                break;
        }

        return result;