I have h:commandLink with target="_blank" and a4j:support in it to reRender section of page - but it doesn't work.

the page opened in new window displays results as expected.

<h:form id="paymentReminderLetter" styleClass="edit">
...

<h:commandLink value="Generate Letter" action="#{paymentReminderLetter.generateLetter}"
target="_blank" type="submit" onclick="return validateForm(document.paymentReminderLetter);">
<a4j:support event="onclick" reRender="paymentReminderSearchResultMessage"/>
</h:commandLink>
...
</h:form>

 <a4j:outputPanel id="paymentReminderSearchResultMessage">
 <h:outputText rendered="#{(paymentReminderLetter.executeSearch) and (empty paymentReminderLetter.paymentReminderLetterList)}">
 No declard but unpaid applicants exist within specified criteria.
 <p/>
 </h:outputText>
</a4j:outputPanel>