How to manage simple TbButtonGroup

simpleUseTbButtonGroup.php

<?php

$this->widget('bootstrap.widgets.TbButtonGroup', array(
    'type'=>'inverse',
    'buttons' => array( 
        array('label' => 'Form Options',
            'url' => 'formOptions', 
            'htmlOptions' => array(     // use htmlOptions for main-menu
                'target' => '_blank', 
                'title' => 'Open in new Window',
            ),  
        ),
        array('label' => 'Print', 'items' => array( 
                array('label' => 'Form 1',
                    'url' => 'form1', 
                    'linkOptions' => array(     // use linkOptions for sub-menu
                        'target' => '_blank', 
                        'title' => 'Preview for Form 1',
                    ),  
                ),
                array('label' => 'Form 2',
                    'url' => 'form2', 
                    'linkOptions' => array(
                        'target' => '_blank',
                        'title' => 'Preview for Form 2',
                    ),  
                ),
            ),
        ),
)));

?>