public function show($type = null, $format = null)
{
$messages = $this->getMessagesForRender($type);
$this->groupForRender = array();
$output = '';
foreach ($messages as $message) {
if (!$message->isFlash()) {
if (!is_null($format)) {
$message->setFormat($format);
}
$output .= $message->render();
}
}
return $output;
}