Yii Booster Tbselect2 Populate Selected

my view:

...
<?php echo CHtml::activeLabel($catForm,'suitable')?>
<?php
$form->widget('bootstrap.widgets.TbSelect2',array(
     'model'=>$catForm,
     'attribute'=>'suitable',
     'data'=>Category::model()->getSubCategories('suitable'),
     'options'=>array(
       'placeholder'=>' -- please select -- ', // add this line
       'allowClear'=>true,
     ),
     'htmlOptions'=>array('multiple'=>'multiple',),
));
...
?>

My model:

class CategoryForm extends CFormModel
{
...
	public $suitable;	
...
}

My Controller:

public function actionCategories($id)
{
	$catForm = new CategoryForm($id);
	if(isset($_POST['CategoryForm'])){
		...
	}
	$this->render('categories',array(
		'model'=>$this->loadModel($id),
		'catForm' => $catForm,
	));
}

My question:
Is possible to populate in advance the Select2 with values that I store inside db before? I tried to pass the array on the __construct but it doesn't work

Thanks is advance