menus - I'm having a lot of trouble since upgrade to 3.0.1 with get_page_children() function in WordPress

I don have enough pages to test, but I have an idea that 10 is default pagination number.

$all_wp_pages = $my_wp_query->
query(array( 'post_type' =>
 'page', 'posts_per_page' =>
 -1 ));

If this doesn work I will try to find some time to generate bunch of pages and test.