Elementor\Controls_Manager::register_control PHP Метод

    public function register_control($control_id, $class_name)
    {
        if (!class_exists($class_name)) {
            return new \WP_Error('element_class_name_not_exists');
        }
        $instance_control = new $class_name();
        if (!$instance_control instanceof Control_Base) {
            return new \WP_Error('wrong_instance_control');
        }
        $this->_controls[$control_id] = $instance_control;
        return true;
    }