public function _render($textOnly) {
        $str = "";
        if ($textOnly)
            $str .= "\nModel Analysis\n==============\n";
        else
            $str .= "<h2>Model Analysis</h2>";
        $str .= $this->analyzeModel($this->configuration->getModel(), $textOnly);
        if ($textOnly)
            $str .= "\nConfiguration Analysis\n======================\n";
        else
            $str .= "</td><td valign='top'><h2>Configuration Analysis</h2>";
        $str .= $this->analyzeConfiguration($this->configuration, $textOnly);
        return $str;
    }