--- cck_fieldgroup_tabs.module.orig	2009-08-25 17:53:03.555571800 +0200
+++ cck_fieldgroup_tabs.module.pre_render	2009-08-27 10:03:34.203125000 +0200
@@ -185,6 +185,13 @@ function cck_fieldgroup_tabs_nodeapi(&$n
               unset($node->content[$key]);
             }
           }
+          // Move all #content_extra_fields into the residual tab in order to allow tabs render them correctly
+          // #pre-render with alter_extra_weights in the tab is needed to sort all the elements right
+          $residual['#content_extra_fields'] = $node->content['#content_extra_fields'];
+          $residual['#pre_render'][] = 'content_alter_extra_weights';
+          unset($node->content['#content_extra_fields'], $node->content['#pre_render']);
+          
           $node->content['fieldgroup_tabs']['fieldgroup_tabs_basic'] = $residual;
         }
       }