/**
  * Adding element
  * 
  * Adds an option to the select field.
  * 
  * <code>
  * $element = array(
  * 	'label' => 'Option 1',
  * 	'value' => 1
  * );
  * </code>
  * Example for an element which can be added. 
  * 
  * @since 1.0
  * @param array/string $element The element
  */
 public function add_element($element = array())
 {
     $defaults = array('id' => id(), 'value' => '', 'label' => $element['value'], 'disabled' => FALSE, 'params' => array());
     $element = wp_parse_args($element, $defaults);
     if (!$element['disabled']) {
         unset($element['disabled']);
     }
     parent::add_element($element);
 }