public function selectAction($id)
    {
        $instance = $this->getManager()->find($id);
        // If instance exists
        if($instance) {
            $this->getRequest()->getSession()->set('instance', $instance);
            if($this->getWorker()) {
                $this->get('session')->getFlashBag()->add('success', 'Instance '.$instance->getName().' selected');
            }else {
                $this->get('session')->getFlashBag()->add('error', 'Instance '.$instance->getName().' cannot be selected');
            }
        }else {
            $this->get('session')->getFlashBag()->add('error', 'This instance does not exist');
        }
        
        return new RedirectResponse($this->generateUrl('ringo_php_redmon'));
    }