/**
  * Get a set of labelled radio buttons.
  *
  * @param $params Array:
  *    Parameters are:
  *      var:            The variable to be configured (required)
  *      label:          The message name for the label (required)
  *      itemLabelPrefix: The message name prefix for the item labels (required)
  *      values:         List of allowed values (required)
  *      itemAttribs     Array of attribute arrays, outer key is the value name (optional)
  *
  * @return string
  */
 public function getRadioSet($params)
 {
     $params['controlName'] = $this->getName() . '_' . $params['var'];
     $params['value'] = $this->getVar($params['var']);
     return $this->parent->getRadioSet($params);
 }