private function initFromGetVariables()
    {
        $key_orderby = $this->getLinkPrefix() . 'orderby';
        $key_orderbydir = $this->getLinkPrefix() . 'orderbydir';

        if (isset($_GET[$key_orderby]) && $_GET[$key_orderby] == $this->id) {
            $this->view->orderby_column = $this;

            if (isset($_GET[$key_orderbydir])) {
                $this->setDirectionByString($_GET[$key_orderbydir]);
            }
        }
    }