wp_list_pages – Get current page class on Custom Post Types

Hi there,

i’m using a function I found in the codex to display “List topmost ancestor and its immediate children” I do this on a page with a custom post type, so not a page.

My Problem is I need the
ul Items to display the class “current-menu-item” to style it.

functions.php

if(!function_exists('get_post_top_ancestor_id')){
/**
 * Gets the id of the topmost ancestor of the current page. Returns the current
 * page's id if there is no parent.
 *
 * @uses object $post
 * @return int
 */
function get_post_top_ancestor_id(){
    global $post;

    if($post->post_parent){
        $ancestors = array_reverse(get_post_ancestors($post->ID));
        return $ancestors[0];
    }

    return $post->ID;
}}

I get the current post type also, to display different stylesheets for the CPTs (e.g a Illustrator Post has illustrator stylesheet, a photoshop post has photoshop stylesheet)

this is my sidebar:

<?php
$area = get_post_type();
global $post;
$postID = $post->ID;
$parent_title = get_the_title($post->post_parent);
?>

<ul class="clearfix">
	<li class="parent">
	<a href="<?php echo get_permalink($post->post_parent) ?>">
	<?php echo $parent_title;?> v </a>
	</li>

	<?php wp_list_pages(
	array('title_li'=>'','include'=>get_post_top_ancestor_id())
	); ?>

	<?php wp_list_pages(
	array('title_li'=>'','depth'=>1,'post_type'=>$area,'child_of'=>get_post_top_ancestor_id())
	); ?>
/ul>

I found in the same codex page Markup and Styling and I am familiar with this on regular menus, but the example from the codex is just working for pages.
How can I make the same work for my custom post type? Right now the just have the classes “page_item page-item-XY” (XY is the id)