Index: wp-admin/includes/meta-boxes.php
===================================================================
--- wp-admin/includes/meta-boxes.php	(revision 18473)
+++ wp-admin/includes/meta-boxes.php	(working copy)
@@ -560,7 +560,7 @@
 function page_attributes_meta_box($post) {
 	$post_type_object = get_post_type_object($post->post_type);
 	if ( $post_type_object->hierarchical ) {
-		$pages = wp_dropdown_pages(array('post_type' => $post->post_type, 'exclude_tree' => $post->ID, 'selected' => $post->post_parent, 'name' => 'parent_id', 'show_option_none' => __('(no parent)'), 'sort_column'=> 'menu_order, post_title', 'echo' => 0));
+		$pages = wp_dropdown_pages(apply_filters( 'page_attributes_dropdown_pages_args', array('post_type' => $post->post_type, 'exclude_tree' => $post->ID, 'selected' => $post->post_parent, 'name' => 'parent_id', 'show_option_none' => __('(no parent)'), 'sort_column'=> 'menu_order, post_title', 'echo' => 0)));
 		if ( ! empty($pages) ) {
 ?>
 <p><strong><?php _e('Parent') ?></strong></p>