main-navigation.php

<div id="navigation-wrapper">
    <div id="navigation-bar">
        <div id="navcontainer">
        <ul class="sf-menu">
                <li<?php if ( is_front_page() ) : ?> class="selected"<?php endif; ?>>
                    <a href="<?php echo site_url() ?>" title="<?php _e( 'Home', 'bp-scholar' ) ?>"><?php _e( 'Home', 'bp-scholar' ) ?></a>
                </li>

                <?php wp_list_pages('title_li='); ?>
 <li><a href="#"><?php _e( 'Exhibitors', 'bp-scholar' ) ?></a>
                <ul>
                <?php wp_list_categories('orderby=name&title_li=');
                $this_category = get_category($cat);
                if (get_categories($thiscategory->cat_ID) != "") {

                wp_list_categories('orderby=id&show_count=0&title_li=
                &use_desc_for_title=1&child_of='.$this_category->cat_ID);

                }
                ?>
                </ul>
</li>
<!--
<li><a href="#"><?php _e( 'Meet the Guild Artists', 'bp-scholar' ) ?></a>
    <ul>
            <li<?php if (  bp_is_page( BP_MEMBERS_SLUG ) || bp_is_member() ) : ?> class="selected"<?php endif; ?>>
                <a href="<?php echo site_url() ?>/<?php echo bp_get_members_root_slug(); ?>/" title="<?php _e( 'Guild Members', 'bp-scholar' ) ?>"><?php _e( 'Guild Members', 'bp-scholar' ) ?></a>
            </li>

            <?php if ( bp_is_active( 'groups' ) ) : ?>
                <li<?php if ( bp_is_page( BP_GROUPS_SLUG ) || bp_is_group() ) : ?> class="selected"<?php endif; ?>>
                    <a href="<?php echo site_url() ?>/<?php echo bp_get_groups_root_slug(); ?>/" title="<?php _e( 'Artist Groups', 'bp-scholar' ) ?>"><?php _e( 'Artist Groups', 'bp-scholar' ) ?></a>
                </li>
            <?php endif; ?>

                <?php if ( 'activity' != bp_dtheme_page_on_front() && bp_is_active( 'activity' ) ) : ?>
            <li<?php if ( bp_is_page( BP_ACTIVITY_SLUG ) ) : ?> class="selected"<?php endif; ?>>
                <a href="<?php echo site_url() ?>/<?php echo bp_get_activity_root_slug(); ?>/" title="<?php _e( 'Artist Updates', 'bp-scholar' ) ?>"><?php _e( 'Artist Updates', 'bp-scholar' ) ?></a>
            </li>
        <?php endif; ?>



            <?php if ( bp_is_active( 'forums' ) && bp_is_active( 'groups' ) && ( function_exists( 'bp_forums_is_installed_correctly' ) && !(int) bp_get_option( 'bp-disable-forum-directory' ) ) && bp_forums_is_installed_correctly() ) : ?>
                <li<?php if ( bp_is_page( BP_FORUMS_SLUG ) ) : ?> class="selected"<?php endif; ?>>
                    <a href="<?php echo site_url() ?>/<?php echo bp_get_forums_root_slug(); ?>/" title="<?php _e( 'Guild Forums', 'bp-scholar' ) ?>"><?php _e( 'Guild Forums', 'bp-scholar' ) ?></a>
                </li>
            <?php endif; ?>

            <?php if ( bp_is_active( 'blogs' ) && bp_core_is_multisite() ) : ?>
                <li<?php if ( bp_is_page( BP_BLOGS_SLUG ) ) : ?> class="selected"<?php endif; ?>>
                    <a href="<?php echo site_url() ?>/<?php echo bp_get_blogs_root_slug(); ?>/" title="<?php _e( 'Artists Info', 'bp-scholar' ) ?>"><?php _e( 'Artists Info', 'bp-scholar' ) ?></a>
                </li>
            <?php endif; ?>
    </ul>
</li>
-->
        <?php do_action( 'bp_nav_items' ); ?>

        </ul>
        </div>      <div class="clear"></div>
    </div>
</div>