[t5] onEvent mixin failure since 5.0.17 - wrong response sent back to server

[Harald Geritzer]

hi all,
i am using the onEvent mixing but since 5.0.17 my code does not seem to work 
any more.

though the event response should be "cost1|cost2" tapestry seems to ignore my 
textstreamresponse and
firebug reports that the response is the value of the selectbox itself
(post: value    750, response: {"value":"750"} instead of cost1|cost2).

any ideas? thank you


i got a select box on my page:
==============================

<t:select t:id="selectQuantity" value="orderItem.quantity" model="graduatedQuantities" 
t:mixins="t5components/OnEvent" event="change" onCompleteCallback="onQuantityChange"/>

with the according javascript function:
=======================================

        <script type="text/javascript">
        function onQuantityChange(response)
        {
            tokens = response.split("|")
            $('costWithoutVat').value = tokens[0];
            $('costWithVat').value = tokens[1];
        }
        </script>


in my code there is an event handler:
=====================================

        @OnEvent(component = "selectQuantity", value = "change")
        public Object onChangeFromSelectQuantity(int value) {
                return quantityChange(value);
        }
        
        public StreamResponse quantityChange(int value)
        {
                getOrderItem().setQuantity(value);
                StringBuilder sb = new StringBuilder();
                sb.append(getCostWithoutVat());
                sb.append("|");
                sb.append(getCostWithVat());
                return new TextStreamResponse("text/html", sb.toString());
        }


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