I receive a jquery error message in admin if i use a group metabox inside another one.
Because of that i can’t see/edit some elements (editor content).

The metaboxes works on frontend.

  <?php

    piklist('field', array(
  'type' => 'group'
  ,'field' => 'section'
  ,'label' =>__('Section','test')
  ,'columns' => 12
  ,'fields' => array(
  array(
    'type' => 'text'
    ,'field' => 'title'
    ,'label' => __('Content', 'test')
    ,'columns' => 12
    ,'attributes' => array(
      'rows' => 5
      )
  ),
  array(
      'type' => 'textarea'
      ,'field' => 'content'
      ,'label' => __('Content', 'test')
      ,'columns' => 12
      ,'attributes' => array(
        'rows' => 5
      )
    ),
   array(
  'type' => 'group'
  ,'field' => 'item_tab'
  ,'label' =>__('Item Tab Section','test')
  ,'columns' => 12
  ,'add_more' => true
  ,'fields' => array(
  array(
  'type' => 'text'
  ,'field' => 'headline'
  ,'label' => __('Headline', 'test')
  ,'columns' => 12
  ),
   array(
  'type' => 'group'
  ,'field' => 'item_tab_list'
  ,'label' =>__('List:','test')
  ,'columns' => 12
  ,'add_more' => true
  ,'fields' => array(
  array(
  'type' => 'text'
  ,'field' => 'title'
  ,'label' => __('Title', 'test')
  ,'columns' => 12
  ),
  array(
    'type' => 'editor'
    ,'field' => 'content'
    ,'label' => __('Content', 'test')
    ,'options' => array(
      'media_buttons' => true
      ,'teeny' => true
      ,'textarea_rows' => 5
      ,'drag_drop_upload' => false
      ,'tinymce' => array(
        'resize' => true
        ,'wp_autoresize_on' => true
      )
    )
  )
  ))
  ))
  )
  ));

  ?>