public function init()
    {
        $this->setName('users');
        $this->setLabel('Users');
        $this->setAttribute('id', 'users');
        
        
        $this->setTargetElement(
            array(
            'type' => 'hidden',
            'name' => 'user',
            )
        );
        
        $this->setCount(0)
             ->setAllowRemove(true)
             ->setAllowAdd(true)
             ->setShouldCreateTemplate(true);
    }