/**
  * Include Required Control Classes
  * 
  * Only includes the classes required for this 
  * control to function if they haven't been 
  * loaded yet.
  *
  * @since 1.3
  * @version 1.3.6
  * 
  */
 public function include_control_class()
 {
     if (!class_exists('WP_Customize_Control')) {
         include_once ABSPATH . WPINC . '/class-wp-customize-control.php';
     }
     if (!class_exists('EGF_Font_Control')) {
         include_once Easy_Google_Fonts::get_includes_path() . '/controls/class-egf-font-control.php';
     }
 }