Sitefinity add class to navigation control template
===

I have a control template in my navigation widget. I am trying to display a border under the current page. In the control template I get the current node in the control template code behind and add the class to display the border.

hyperLink.Attributes.Add("class", "activePrimary");

The hyperlink is rendered with 2 classes.

<a id="ctl00_NavPrimaryTopPlaceholder_C008_ctl00_ctl00_MenuRadListView_ctrl0_MenuItemHyperLink" class="top" class="activePrimary" href="home">Home</a>

I assume Sitefinity is placing the class="top". How can I append my class after the top?

Thanks in advance.
