Multiple back bean calls for rendered panels

Question

Hello,
We have experienced some strange behaviours, when rendering a panel based on some back bean paramater the backing bean method is called multiple times. It seems that the backing bean is called for each child element is the panel.
For instance in the following example the backing bean will be called 6 times.
<t:div id="test" rendered="#{! empty UCB.attribut}" >
     <t:outputText value="text1" />
     <t:outputText value="text2" />
     <t:outputText value="text3" />
     <t:outputText value="text4" />
     <t:outputText value="text5" />
</t:div>Is this a configuration issue or just how jsf is implemented?
//Chris

Answer 1

Called sequentially (from my original post):
wsCodeList["GetTupleList"].arguments.TupleName = "BUSTYPE";
var call:Object = wsCodeList["GetTupleList"].send();
call.destination = "busType";
wsCodeList["GetTupleList"].arguments.TupleName = "ENTTYPE";
call = wsCodeList["GetTupleList"].send();
call.destination = "entityType";
The docs seem to say this is allow and example found online
do similar, except the arguments are passed as a parameter to send.
This doesn't work for me though. The web service I'm using will
only take the arguments using the arguments object.