Index: wp-admin/js/comment.js
===================================================================
--- wp-admin/js/comment.js	(revision 21695)
+++ wp-admin/js/comment.js	(working copy)
@@ -1,5 +1,7 @@
 jQuery(document).ready( function($) {
 
+	postboxes.add_postbox_toggles('comment');
+
 	var stamp = $('#timestamp').html();
 	$('.edit-timestamp').click(function () {
 		if ($('#timestampdiv').is(":hidden")) {
Index: wp-includes/script-loader.php
===================================================================
--- wp-includes/script-loader.php	(revision 21695)
+++ wp-includes/script-loader.php	(working copy)
@@ -376,9 +376,9 @@
 			'comma' => _x( ',', 'tag delimiter' ),
 		) );
 
-		$scripts->add( 'link', "/wp-admin/js/link$suffix.js", array('wp-lists', 'postbox'), false, 1 );
+		$scripts->add( 'link', "/wp-admin/js/link$suffix.js", array( 'wp-lists', 'postbox' ), false, 1 );
 
-		$scripts->add( 'comment', "/wp-admin/js/comment$suffix.js", array('jquery') );
+		$scripts->add( 'comment', "/wp-admin/js/comment$suffix.js", array( 'jquery', 'postbox' ) );
 		$scripts->add_data( 'comment', 'group', 1 );
 		did_action( 'init' ) && $scripts->localize( 'comment', 'commentL10n', array(
 			'submittedOn' => __('Submitted on:')