Index: includes/content.node_form.inc
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/cck/includes/Attic/content.node_form.inc,v
retrieving revision 1.7.2.19.2.9
diff -u -p -r1.7.2.19.2.9 content.node_form.inc
--- includes/content.node_form.inc	31 Jan 2011 12:28:07 -0000	1.7.2.19.2.9
+++ includes/content.node_form.inc	3 Feb 2011 23:14:30 -0000
@@ -412,6 +412,12 @@ function content_add_more_submit($form, 
  * Menu callback for AHAH addition of new empty widgets.
  */
 function content_add_more_js($type_name_url, $field_name) {
+  // Switch to administration theme if it is set to be used for content editing.
+  if (variable_get('node_admin_theme', 0) && variable_get('admin_theme', '0')) {
+    global $custom_theme;
+    $custom_theme = variable_get('admin_theme', '0');
+  }
+
   $content_type = content_types($type_name_url);
   $type = content_types($type_name_url);
   $field = content_fields($field_name, $type['type']);
Index: modules/content_multigroup/content_multigroup.node_form.inc
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/cck/modules/content_multigroup/Attic/content_multigroup.node_form.inc,v
retrieving revision 1.1.2.16
diff -u -p -r1.1.2.16 content_multigroup.node_form.inc
--- modules/content_multigroup/content_multigroup.node_form.inc	2 Feb 2011 12:20:43 -0000	1.1.2.16
+++ modules/content_multigroup/content_multigroup.node_form.inc	3 Feb 2011 23:14:31 -0000
@@ -732,6 +732,12 @@ function content_multigroup_add_more_sub
  * Adapted from content_add_more_js to work with groups instead of fields.
  */
 function content_multigroup_add_more_js($type_name_url, $group_name) {
+  // Switch to administration theme if it is set to be used for content editing.
+  if (variable_get('node_admin_theme', 0) && variable_get('admin_theme', '0')) {
+    global $custom_theme;
+    $custom_theme = variable_get('admin_theme', '0');
+  }
+
   $content_type = content_types($type_name_url);
   $groups = fieldgroup_groups($content_type['type']);
   $group = $groups[$group_name];