/**
* Add fieldset.
*
* @param Form\FieldSet $fieldSet FieldSet object.
* @param int|null $order FieldSet order.
*
* @return $this
*/
public function addFieldSet(Form\FieldSet $fieldSet, $order = null)
{
if (!$order) {
$order = $this->_currentOrder++;
}
$this->_fieldSets[$order] = $fieldSet;
$this->_order[$fieldSet->getName()] = $order;
return $this;
}
