convertNumber type="currency" is not called by ajax command

[eunnini]

I have a problem with convertNumber and type="currency".

This is the situation:

I have two command links. First have to display price in euros, and second have to display price in pounds

<a4j:commandLink actionListener="#{userSession.settingEuroPrice}" value="Euro Value" reRender="form"/>
<a4j:commandLink actionListener="#{userSession.settingPoundPrice}" value="Pound Value" reRender="form"/>

And this is the output

<h:outputText value="#{userSession.price}" >
 <f:convertNumber type="currency" currencySymbol="#{userSession.currencySign}"/>
</h:outputText>

But when I press command link, my method (userSession.settingEuroPrice) is called, new currency sign is set, but userSession.currencySign is not called until page refresh and currency sign is not displayd.

If I use h:commandLink instead of a4j:commandLink, everything is works ok

This is the backing bean

 private String currencySign;
 private double price;

 public void settingEuroPrice(ActionEvent event){
 currencySign = "\u20AC";
 price = 1000;
 }

 public void settingPoundPrice(ActionEvent event){
 currencySign = "\u00A3";
 price = 2000;
 }

 public String getCurrencySign() {
 return currencySign;
 }