NavBAr Tab Colour Change One Only Like on Vbulletin PURCHASE tab

[goxy63]

Sorry to bring this up again

I also need to change just one tab, but not sure where to look for this?
navigation.php ? I dont think so

I've searched templates for <a class="navtab" and it exists only in "navbar_tabs"

<vb:each from="tabs" value="tab" key="tabid">
	<li<vb:if condition="$selected == $tabid"> class="selected"</vb:if> id="{vb:raw tab.name}">
		<a class="navtab" href="{vb:raw tab.url}">{vb:raw tab.title}</a>
		<vb:if condition="$tab['children'] AND $selected == $tabid">
			<ul class="floatcontainer">
				<vb:each from="tab.children" value="link">
					<vb:if condition="$link['children']">
						<li class="popupmenu" id="{vb:raw link.name}">
							<a href="javascript://" class="popupctrl">{vb:raw link.title}</a>
							<ul class="popupbody popuphover">
								<vb:each from="link.children" value="sublink">
									<li id="{vb:raw sublink.name}"><a href="{vb:raw sublink.url}">{vb:raw sublink.title}</a></li>
								</vb:each>
								{vb:raw template_hook.navbar_after_sublinks}
							</ul>
						</li>
					<vb:else />
						<vb:if condition="$link['type'] == 'link'">
							<li id="{vb:raw link.name}"><a href="{vb:raw link.url}">{vb:raw link.title}</a></li>
						</vb:if>
					</vb:if>
				</vb:each>
				{vb:raw template_hook.navbar_after_links}
			</ul>
		</vb:if>
	</li>
</vb:each>

But not sure how to edit this part for one of my tabs, my tabs are created in default VB4.2.0 "navigation menager"

Thank you