Mixin's AfterRender method isn't called after ajax update

[Poggenpohl, Daniel]

Hello,

we have a zone containing an element with a Mixin. An Ajax update reloads the 
zone contents and so should, if I understand it right, re-render the elements 
in the zone. So it should re-render the element with the Mixin.

So basically, we have a

<t:Zone t:id="someZone">
                <t:Any mixins="someMixin"/>
</t:Zone>

The Mixin has a method
@AfterRender
doSomething() {
                [...]
}

Why isn't the method called?

Regards,
Daniel