public function getPrivateSource()
 {
     $sourcePrivate = '';
     if (isset($this->afExtjs->private['toolbar'])) {
         unset($this->afExtjs->private['toolbar']);
     }
     if (isset($this->afExtjs->private['north_panel'])) {
         unset($this->afExtjs->private['north_panel']);
     }
     if (isset($this->afExtjs->private['south_panel'])) {
         unset($this->afExtjs->private['south_panel']);
     }
     if (isset($this->afExtjs->private['center_panel'])) {
         unset($this->afExtjs->private['center_panel']);
     }
     if (isset($this->afExtjs->private['center_panel_first'])) {
         unset($this->afExtjs->private['center_panel_first']);
     }
     foreach ($this->afExtjs->private as $key => $value) {
         $sourcePrivate .= sprintf("%svar %s = %s;", afExtjs::LBR, $key, afExtjs::_quote($key, $value));
     }
     return $sourcePrivate;
 }