Yii Bootstrap Tbgrupobutton

I need to fill a bootstrap.widgets.TbButtonGroup like a Dropdownlist, i have this:


$models = ZfInfraestructuras::model()->findAll(array('order' => 'infraestructura_nombre'));


        $list = CHtml::listData($models, 

                'infraestructura_id', 'infraestructura_nombre');


        echo CHtml::dropDownList('infraestructuras', $models, 

              $list,

              array('prompt' => 'Selecciona Infraestructura'));

And it works, but i need this:


<?php $this->widget('bootstrap.widgets.TbButtonGroup', array(

        'type'=>'', // '', 'primary', 'info', 'success', 'warning', 'danger' or 'inverse'

        'buttons'=>array(

            array('label'=>'Selecciona Infraestructura', 

                  'items'=>array($list),


            )),

        ),

    )); ?>

I dont need to use the variable $list, i just need the same result.

Thanks!