src/PeekAndPoke/Component/Formal/Form.php
public function addExtra($id, IFormField $formField)
    {
        $formField->setId($id);

        return $this->addFormField($formField, true);
    }
public function addExtra($id, IFormField $formField)
    {
        $formField->setId($id);

        return $this->addFormField($formField, true);
    }
Add an extra field to the form.

An extra field is not tracked or mapped to the subject.

@param string     $id
@param IFormField $formField

@return IFormField