I've got my own wiz bang extension of RepeatingView and I want to add class
attributes "last", "first" to the children for the HTML monkey.

Is the best way to add an AttributeAppender to each child Component that
uses an IModel to get the class? Maybe in beforeOnRender I can't see an
onChildAttach or onChildRemove method or anything like that. All my ideas
seem a bit heavy and clumsy.

This must be somewhere in existing code or Nabble but I'm afraid I couldn't
see it. Sorry.
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