richfaces tag and validation problem

[btl_ayd]

Hi
My problem is that when I set required attriubute of input component as false the ajax event and richface event doesnt work.
here is my code

<td><h:selectManyMenu id="tk" value="#{TestRapor.testkod}" style="width: 196px; height: 308px" required="true" requiredMessage="Alanın girilmesi zorunludur" immediate="true">
<f:selectItems value="#{TestRapor.testad}"/></h:selectManyMenu></td>
<td><a4j:outputPanel ajaxRendered="true"><h:message for="tk" errorClass="error"/></a4j:outputPanel></td>

When button has been clicked ,panel must be visible but caused of <h:selectManyMenu component's required attribute it doesnt work.Can anybody say what is problem.

[ilya_shaikovsky]

There is not enough info in this post. I can't see ajax components and can't understand the phrase about "ajax event doesn't work".. Please add more full snippet and describe what you trying to perform on the page more carefully.