WP Shortcode: [listpages]

functions.php

<?php

/**
 * Shortcode: [listpages]
 * @return title of current page followed by child pages
 */
function listpages_func() {

	global $post;
	$html  = '';

	if ($post->post_parent)
		$children = wp_list_pages('title_li=&child_of='.$post->post_parent.'&echo=0&sort_column=menu_order'); 
	else
		$children = wp_list_pages('title_li=&child_of='.$post->ID.'&echo=0&sort_column=menu_order');
	
	if ($children):
		$html .= '<h4 style="margin-bottom:5px; padding-bottom:3px;">';
		$html .= '<a href="'.get_permalink($post->post_parent).'">'.get_the_title($post->post_parent).'</a>';
		$html .= '</h4>';
		$html .= '<ul class="sc_list sc_list_style_arrows subpages">';
		$html .= $children; 
		$html .= '</ul>';
	endif;

	return $html;
}

add_shortcode('listpages', 'listpages_func');