Sigma Templating

Question about Sigma Template on the HTML_QuickForm_Renderer_ITDynamic page: On this page: http://pear.php.net/manual/en/package.html.html-quickform.html-quickform-renderer-itdynamic.php a template is shown with a group element as follows:

    <!-- BEGIN qf_group -->
    <tr valign="top" bgcolor="#FF9933">
        <td align="right">
            <!-- BEGIN qf_group_required --><span style="color: #FF0000;">*</span><!-- END qf_group_required -->
            <b>{qf_group_label}</b>
        </td>
        <td>
            <!-- BEGIN qf_group_error --><span style="color: #FF0000;">{qf_error}</span><br /><!-- END qf_group_error -->
            <!-- BEGIN qf_group_loop -->
                <!-- BEGIN qf_group_element -->{qf_separator}{qf_element}<!-- END qf_group_element -->
            <!-- END qf_group_loop -->
        </td>
    </tr>
    <!-- END qf_group -->

Could someone explain how I can continue to use groups created by quickform, but use a specific formating for a particular group. Example, I want to have three different groups on the page, but I want them to be formatted differently.

                |

Group A | Group B _______|________

           Group C

Basically I want to understand how to tell the template system that I have a specially named group that I want to be custom formatted. Many Thanks, Jesse