Change id or add css class to ul having dropdown-menu of Yiistarp TbNav widget

I have below code to create navigation menu using YiiStrap widget Tbnav .




$this->widget('TbNav', array(

    'htmlOptions' => array(

        'class' => 'navbar-left',

        'id' => 'category-menu'

    ) ,

    'encodeLabel' => false,

    'activateItems' => false,

    'items' => array(

        array(

            'htmlOptions' => [

                'class' => 'submenu-bar',

                'id' => 'main-nav'

             ],

            'activateParents' => true,

            'label' => '<span class="glyphicon glyphicon-th" style="margin-right:5px;"></span> Categories',

            'items' => array_merge(

               array(

                array(

                    'label' => 'Browse All',

                    'url' => array('mylink/all')

                ) ,

                TbHtml::menuDivider()

               ) , 

               array(

                array(

                    'label' => 'Category 1',

                    'url' => array('list/cat1')

                )

               ), 

               array(

                array(

                    'label' => 'Category 2',

                    'url' => array('list/cat2')

                )

               )

              ) ,

            ) ,

      ) ,

));



And it generates below HTML code





<ul role="menu" id="category-menu" class="navbar-left nav navbar-nav">

<li role="menuitem" activateparents="1" id="main-nav" class="submenu-bar dropdown"><a href="" data-toggle="dropdown" class="dropdown-toggle"><span style="margin-right:5px;" class="glyphicon glyphicon-th"></span> Categories <b class="caret"></b></a>

    <ul role="menu" aria-labelledby="yt0" id="yt0" class="dropdown-menu">

        <li role="menuitem"><a href="/mylink/all" tabindex="-1">Browse All</a></li>

        <li class="divider"></li>

        <li role="menuitem"><a href="/list/cat1" tabindex="-1">Category 1</a></li>

        <li role="menuitem"><a href="/list/cat2" tabindex="-1">Category 2</a></li>

    </ul>

</li>



How can i change id or add class to ul element having class="dropdown-menu".

[b]<ul role="menu" aria-labelledby="yt0" id="yt0" class="dropdown-menu">

[/b]

I have tried adding submenuHtmlOptions but it gives me error .