Major Description
If you have a form like this:
<form wicket:id="form">
<input type="text" wicket:id="name" />
<div wicket:id="wmc">
<select wicket:id="chooser" />
</div>
<input type="submit" value="Save" />
</form>
The ListChoice component is updated via OnChangeAjaxBehavior on the TextField. When you submit this form, the validation for 'chooser' will fail, because it can't find it's model.