separators for HTML_QuickForm_date elements

Hi,

i saw a lot of threads about groups and separators but i could find a
answer to that :
can we set customized separators for  HTML_QuickForm_date's elements ?

As it inherits from HTML_QuickForm_group, i thought i could set the
'_separator' property, as it works for a group created with 'addGroup()'.
i mean for ex :
/        $txtElm1=&HTML_QuickForm::createElement('text', 'nombre1',
'Nombre 1'.':', array('size'=>30, 'maxlength'=>100));
$txtElm2=&HTML_QuickForm::createElement('text', 'nombre2',
'Nombre 2'.':', array('size'=>30, 'maxlength'=>100));
$txtElm3=&HTML_QuickForm::createElement('text', 'nombre3',
'Nombre 3'.':', array('size'=>30, 'maxlength'=>100));
$grupoTexto =
&$this-> addGroup(array($txtElm1,$txtElm2,$txtElm
3),'GrupoTexto','label
grupo :','-');
$grupoTexto->_separator=array('-','-');
/
This works fine. But if i try it for a HTML_QuickForm_date it has no
effect :

/    $dateFrom = new HTML_QuickForm_date('dateFrom','Fecha',
array('language'=>'es','format'=>'dFYHi'));
$dateFrom->_separator=array('','','@','h');
$this->addElement($dateFrom);

/Any idea ?
Thanks.