How to make a select box read-only?

[full_metal]

Hi,

Here is my FormMapper 

protected function configureFormFields(FormMapper $formMapper)

    {

        $formMapper

            ->add('affiliatePartner', null, array('attr' => array('required' => false, 'widget' => 'single_text', 'readonly' => true)))

    }

It does show a gray read only - select box. But I am still able to change the value. 
I don't mind if it displays the same in a readonly textbox. 

Please find the image attached. 

Thanks,
Amit

[full_metal]

Friendly bump. 

Here is the entity definition of the field:

   /**

     * @ORM\ManyToOne(targetEntity="AffiliatePartner")

     */

    protected $affiliatePartner;

[full_metal]

Okay, its done this way:

protected function configureFormFields(FormMapper $formMapper)

    {

        $formMapper

            ->add('affiliatePartner', null, array('read_only' => true))

    }