AcmeDemoBundleFormTypePictureType.php

<?php
namespace Acme\DemoBundle\Form\Type;

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilder;

class PictureType extends AbstractType
{
    public function buildForm(FormBuilder $builder, array $options)
    {
        $builder
            ->add('data', 'hidden')
            ->add('picture_uploadify', 'uploadify_resource', array(
                'data' => array(
                    'folder'  => '/uploads/files/',
                    'preview' => 'picture_preview',
                    'path'    => 'AcmeDemoBundle_upload',
                    'copy'    => $this->getName() . '_' . 'data'
                ),
                'uploadify' => array(
                    'auto'  => false,
                    'multi' => true,
                    // ... other options from http://www.uploadify.com/documentation/
                ),

                'property_path' => false
            ))
        ;
    }

    public function getName()
    {
        return "picture_type";
    }
}