public function renderTemplateFile($templateFile, Framework $framework, RequestAbstract $request, Response $response, $additionalData = array())
    {
        if (!file_exists($templateFile)) {
            return;
        }
        
        // Start the output buffer
        ob_start();
        
        // Render the template
        include($templateFile);
        
        // Get the content and deactivate the output buffer
        $content = ob_get_contents();
        ob_end_clean();
        
        return $content;
    }