protected function show_available_child_styles(&$styles, $name, $level)
{
foreach ($styles as &$style) {
if (empty($style['_shown']) && $style['_inherit_name'] == $name) {
$this->list_style($style, $level);
$this->show_available_child_styles($styles, $style['style_name'], $level + 1);
}
}
}