public function load()
{
$config = $this->getConfig();
$length = new Element\Text('length');
$length->setAttributes(array('value' => isset($config['length']) ? $config['length'] : '', 'class' => 'form-control', 'id' => 'length'));
$length->setOptions(array('label' => 'Length', 'label_attributes' => array('class' => 'required control-label col-lg-2')));
return $length;
}