/**
  * Returns a block of XHTML-valid code that contains markup for this specific
  * component. 
  * @param string $fieldName The field name to use when outputting form data or
  * similar parameters/information.
  * @access public
  * @return string
  */
 function getMarkup($fieldName)
 {
     ob_start();
     foreach ($this->getChildren() as $childName => $child) {
         print "\n\t<div>[[" . $childName . "]] </div>";
     }
     $this->setContent(ob_get_clean());
     return parent::getMarkup($fieldName);
 }