Form/Type/CropInstanceType.php
public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('left', 'hidden', array(
                'attr' => array(
                    'class' => 'fenrizbes-crop-bundle-instance-left'
                )
            ))
            ->add('top', 'hidden', array(
                'attr' => array(
                    'class' => 'fenrizbes-crop-bundle-instance-top'
                )
            ))
            ->add('width', 'hidden', array(
                'attr' => array(
                    'class' => 'fenrizbes-crop-bundle-instance-width'
                )
            ))
            ->add('height', 'hidden', array(
                'attr' => array(
                    'class' => 'fenrizbes-crop-bundle-instance-height'
                )
            ))
            ->add('min_width', 'hidden')
            ->add('min_height', 'hidden')
        ;
    }
public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('left', 'hidden', array(
                'attr' => array(
                    'class' => 'fenrizbes-crop-bundle-instance-left'
                )
            ))
            ->add('top', 'hidden', array(
                'attr' => array(
                    'class' => 'fenrizbes-crop-bundle-instance-top'
                )
            ))
            ->add('width', 'hidden', array(
                'attr' => array(
                    'class' => 'fenrizbes-crop-bundle-instance-width'
                )
            ))
            ->add('height', 'hidden', array(
                'attr' => array(
                    'class' => 'fenrizbes-crop-bundle-instance-height'
                )
            ))
            ->add('min_width', 'hidden')
            ->add('min_height', 'hidden')
        ;
    }
{@inheritdoc}