t5Components + Return JSONArray to component

[Joe123 ---]

I used the T5Components OnEvent. But for some reason I don't get the JSONArray 
as a response in the javascript code.

I can see the javascript is called, but the response is "Undefined". I have no 
clue what causes the problem. And am struggling with this issue for a couple of 
days. I upgraded to tapestry 5.0.18. I had this working in an earlier version 
of tapestry and t5components.

@OnEvent(component = "operator", value = "change")
public JSONArray onChangeOperatorEvent(String value) {
   JSONArray jsonArray = new JSONArray();
   for (Plaza plaza : getDestinationSelectValues(value)) {
      JSONObject jsonObject = new JSONObject();
      jsonObject.put("value", plaza.getId());
      jsonObject.put("label", plaza.getDescription());
      jsonArray.put(jsonObject);
   }
 return jsonArray;
}

Finally, the onCompleteOperatorChange javascript function has to parse the 
return JSON and update the select input options:

function onCompleteOperatorChange(response) {
    selectElement = $("entryPlaza");
    responseJSON = response.evalJSON();
    while (selectElement .options.length > 0) {
        selectElement .options[0] = null;
    }

    for (index = 0; index < responseJSON .length; index++) {
        selectElement.options[index] = new Option(responseJSON[index].label, 
responseJSON [index].value);
    }
    Tapestry.ElementEffect.highlight($("entryPlaza"));
}
But the response is "Undefined" .



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