Backend\Core\Engine\Base\Action::display PHP Method

    public function display($template = null)
    {
        // parse header
        $this->header->parse();
        /*
         * If no template is specified, we have to build the path ourself. The default template is
         * based on the name of the current action
         */
        if ($template === null) {
            $template = '/' . $this->getModule() . '/Layout/Templates/' . $this->URL->getAction() . '.html.twig';
        }
        $this->content = $this->tpl->getContent($template);
    }