How to add order to horizontal category navigation bar?

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I have tried EVERYTHING to get my bar in alphabetical order but it just doesn’t seem to want to budge. I have tried to use the “orderby=” , “order=” and anything else suggested can someone PLEASE help me. This is wrecking my head.

<div id="menu-wrap">

		<?php if(function_exists('wp_nav_menu')) :
		wp_nav_menu( array( 'sort_column' => 'menu_order', 'container_class' => 'ts-menu-main', 'menu_class' => 'sf-menu', 'fallback_cb' => 'ts_menu', 'theme_location' => 'main' ) );
		else : ?>

		<div class="ts-menu-main">
		    <ul class="sf-menu">
		        <?php if(!ts_get_option('ts_ex_home')) : ?>
		        <li<?php if(is_front_page()) echo ' class="current"'; ?>><a href="<?php bloginfo('url'); ?>" title="<?php _e('Home',TS_DOMAIN); ?>"><?php _e('Home',TS_DOMAIN); ?></a></li>
		        <?php endif; ?>
		        <?php $ex_cats = ts_get_option('ts_ex_cats'); wp_list_categories('title_li=$category='.$current_cat.'&exclude='.$ex_cats.'&orderby=slug'); ?>
		    </ul>
		</div>

		<?php endif; ?>

	</div>

That is my header that contains the nav bar.

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