public function load_scripts_styles()
 {
     parent::load_scripts_styles();
     //if newsletter message type is active then let's add filter and load js for it.
     if (EEH_MSG_Template::is_mt_active('newsletter')) {
         //enqueue newsletter js
         wp_enqueue_script('ee-newsletter-trigger', REG_CAF_ASSETS_URL . 'ee-newsletter-trigger.js', array('ee-dialog'), EVENT_ESPRESSO_VERSION, TRUE);
         wp_enqueue_style('ee-newsletter-trigger-css', REG_CAF_ASSETS_URL . 'ee-newsletter-trigger.css', array(), EVENT_ESPRESSO_VERSION);
         //hook in buttons for newsletter message type trigger.
         add_action('AHEE__EE_Admin_List_Table__extra_tablenav__after_bottom_buttons', array($this, 'add_newsletter_action_buttons'), 10);
     }
 }