only in patch2:
unchanged:
--- a/plugins/export_ui/ctools_export_ui.class.php
+++ b/plugins/export_ui/ctools_export_ui.class.php
@@ -212,8 +212,10 @@ class ctools_export_ui {
     if (!empty($replace_form)) {
       $commands[] = ajax_command_replace('#ctools-export-ui-list-form', $form);
     }
-    print ajax_render($commands);
-    ajax_footer();
+    return array(
+      '#type' => 'ajax',
+      '#commands' => $commands,
+    );
   }
 
   /**