http://cwiki.apache.org/WICKET/dropdownchoice-examples.html#DropDownChoiceExamples-UsingAjax
Here   is an example from wiki. 


Rich Livingstone wrote:
> 
> I'm just not sure how to do this - for example, I have a drop down choice
> and when it changes, I need to populate other fields. I had presumed the
> way to do this was to change the values in an attached PropertyModel and
> any text or other UI fields which were attached to this model would be
> automatically updated. But this doesn't seem to be so.
> 
> It seems an obvious thing but I can't find it in any of the forums - if
> it's possible it's got to be simple, yes ?
> 

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