Index: modules/field_ui/field_ui.admin.inc
===================================================================
RCS file: /cvs/drupal/drupal/modules/field_ui/field_ui.admin.inc,v
retrieving revision 1.88
diff -u -r1.88 field_ui.admin.inc
--- modules/field_ui/field_ui.admin.inc	15 Dec 2010 04:13:48 -0000	1.88
+++ modules/field_ui/field_ui.admin.inc	9 Jan 2011 14:12:55 -0000
@@ -126,7 +126,7 @@
 
   $parents = array();
   $list = drupal_map_assoc(element_children($elements));
-
+print_r($list);
   // Iterate on rows until we can build a known tree path for all of them.
   while ($list) {
     foreach ($list as $name) {
@@ -169,6 +169,7 @@
       }
     }
   }
+print_r($trees);
   // Determine rendering order from the tree structure.
   foreach ($regions as $region_name => $region) {
     $elements['#regions'][$region_name]['rows_order'] = array_reduce($trees[$region_name], '_field_ui_reduce_order');