Thanks Kafkaesqui.. yes it work. but its not work on child page.
i put on page.php
<?php
if($post->post_parent)
$children = wp_list_pages("title_li=&child_of=".$post->post_parent."&echo=0"); else
$children = wp_list_pages("title_li=&child_of=".$post->ID."&echo=0");
if ($children) { ?>
<ul>
<?php echo $children; ?>
</ul>
<?php } ?>
when click on child page menu on current page. the header will not show and just get naked content.
