/**
  * Constructor.
  *
  * Register an administration breadcrumb settings field.
  *
  * @access public
  *
  * @param string $id The ID of the field.
  * @param string $title The title of the field.
  * @param string $section The name of the section.
  * @param array $args Additional args.
  */
 public function __construct($id, $title, $section = '', $args = array())
 {
     $this->set_id($id);
     $this->set_title($title);
     add_settings_field($id, $title, array($this, 'render'), Carbon_Breadcrumb_Admin_Settings::get_page_name(), $section, $args);
     register_setting(Carbon_Breadcrumb_Admin_Settings::get_page_name(), $id);
 }