Set Customer Account Link Active (even on sub pages)

Question

After creating a custom page (and navigation link) in the customer account section, there seems to be an issue with keeping the link active (in the customer_account_navigation block) when going to a sub page.

In other words: I have a custom customer page called 'dealers/orders', when clicked on the link called 'Dealer orders' is highlighted on the right hand side.

However when a dealer clicks on 'order details' which takes them to dealers/orders/orderdetails/id/x the link on the right hand side is not active.

Here is what I tried so far:

Setting the following in my xml for the page:

 <dealers_orders_orderdetails>
    <reference name="root">
        <action method="setTemplate"><template>page/1column.phtml</template></action>
        <block type="customer/account_navigation" name="navigation_dealer">
            <action method="setActive"><path>dealers/orders</path></action>
        </block>
    </reference>
</dealers_orders_orderdetails>

The setActive function is being called (can see it when logging) but it doesn't seem to highlight the desired link.

Any help would be appreciated