Yiistrap - How To Render Whdatetimepicker Inside Tbactiveform

Hi,

I am playing with yiistrap and yiiwheels. I want to use WhDateTimePicker inside of TbActiveForm. I want to render also its label and validation errors, so I used method TbHtml::customActiveControlGroup:

<?php $form = $this->beginWidget('bootstrap.widgets.TbActiveForm'); ?>

// ...

    <?php $datePicker = $this->widget('yiiwheels.widgets.datetimepicker.WhDateTimePicker', array(
        'model' => $model,
        'attribute' => 'date_',
    ), true); ?>

    <?php echo TbHtml::customActiveControlGroup($datePicker, $model, 'date_'); ?>

// ...

<?php $this->endWidget(); ?>

Widget itself works fine and also label is rendered. But validation error is not shown. I would expect so, because all others methods named *ControlGroup render also errors. How to do it? Thanks.