// code to create the text fields etc...

//below the code to add the created elements above to the form
$this->addElements(array($loginName, $wachtwoordA, $wachtwoordB, $firstName, $lastName, $emailA, $emailB,$company,  $address, $zipcode, $gemeente, $country, $tel, $submit));
       
//below the code to add the loginname & password field to the "login info" displaygroup 
$login = $this->addDisplayGroup(array('loginName', 'wachtwoordA', 'wachtwoordB') ,'login info');
// $login->setLegend('Your login information');// $login->setDescription('Your login information');
$login->setName('Your login Information');