How to pass selected checkboxes to DoctrineModule\Form\Element\ObjectMultiCheckbox?

Question

Doctrine ORM

Can you please tell me how to pass options for selected checkboxes to the checked view?
Used by Zend Framework 2, doctrine 2.4, many-to-many
Element adding code:

$this->add(array(
            'name' => 'workerId',
            'type' => 'DoctrineModule\Form\Element\ObjectSelect',
            'options' => array(
                'label' => 'TESTE',
                'object_manager' => $this->getObjectManager(),
                'target_class'   => 'Backend\Entity\Worker',
                'property'       => 'name'
            )
        ));