Index: wp-includes/classes.php =================================================================== --- wp-includes/classes.php (revision 10746) +++ wp-includes/classes.php (working copy) @@ -1172,6 +1172,8 @@ $css_class .= ' current_page_parent'; } + $css_class = implode(' ', apply_filters('page_css_class', explode(' ', $css_class), $page)); + $output .= $indent . '