$data->idcne = $jinput->get('filter_idcne', $this->getState('filter.idcne'), 'INT');

$data->idcne = 5;

$this->item		= $item		= $this->get('Item'); 
$this->form		= $form		= $this->get('Form');

...&filter_idcne=5

	$fieldSet = $this->form->getFieldset('newcandidatos.form'); //My New FORM
	$field = $fieldSet['jform_nome']; 
        echo $field->input;  //This print my InputText name. OK!

	$fieldSet = $this->form->getFieldset('newcandidatos.form'); //My New FORM
	$field = $fieldSet['jform_nome']; 
       $field->value = 'change val test';  // Cannot access protected property JFormFieldCktext::$value (X.x)

$field->set('value', 'change val test');

$field->setJdomOptions(array(
    'dataValue' => 'change val test'
));

classes/form/field.php