Displaying a tree of entities with actionLink and Zone

[nille hammer]

Hi list,

I've got an entity "Area" which can have child-Areas asf. I want to implement a 
component "AreaDisplay" that renders an actionLink for each area that shall 
update a zone with children. The tml is as follows:

<t:container xmlns:t="http://tapestry.apache.org/schema/tapestry_5_1_0.xsd";
    xmlns:p="tapestry:parameter">
    <div>
        <a href="#" t:type="ActionLink" t:id="toggleChildren" 
t:zone="childrenZone"
            t:disabled="${toggleChildrenDisabled}">
            ${area.name}
            (${childrenSize})
        </a>
    </div>
    <ul t:type="zone" t:id="childrenZone" t:visible="childrenVisible">
        <li t:type="loop" t:id="childEntries" t:value="childEntry">
            <t:AreaDisplay area="area" />
        </li>
    </ul>
</t:container>

I get an exception telling me that components must not contain themselves. 
Could someone give me a hint how to implement this.

Thanks in advance, nillehammer