Hi,
did you try this:
<?php wp_list_pages('child_of='.$post->ID.'&sort_column=post_title'); ?>
You can also use a custom query like that:
<?php
$childPages = new WP_Query('post_type=page&post_parent='.$post->ID.'&showposts=-1'};
while ($childPages->have_posts()) : $childPages->the_post();
?>
<?php php the_title(); ?> ... etc.
<?php endwhile; ?>