/**
  * Main Pootle Page Builder Pro Instance
  * Ensures only one instance of Storefront_Extension_Boilerplate is loaded or can be loaded.
  * @since 1.0.0
  * @return Pootle_Page_Builder_Pro instance
  */
 public static function instance()
 {
     if (null == self::$_instance) {
         self::$_instance = new self();
     }
     return self::$_instance;
 }
 /**
  * Initiates public class and adds public hooks
  * @since 1.0.0
  */
 private function _public()
 {
     //Instantiating public class
     $this->public = Pootle_Page_Builder_Pro_Public::instance();
     //Adding front end JS and CSS in /assets folder
     $this->public->init();
     //Add row CSS to row
     add_action('pootlepb_before_row', array($this->public, 'row_css'), 25);
 }