"h:selectOneMenu" with Ajax4JSF passing selection to backing

[raviies]

I'm a JSF newbie; Sorry for cross posting in JSF forums; I did not realize the aptness of this forum for my problem

I have a form with a dropdown; I want to pass my selection on the "fly" to the backing bean by using Ajax4JSF;

Unfortunately I'm not able to able to pass on the "fly"; However form submit seems to work

<f:view>
<h:form>
<h:panelGrid columns="2">
.....

 SRB DataTransferScheme *
 <h:selectOneMenu id="dataTransferCombobox" value="#{loginBean.dataTransferScheme}"
 <a4j:support event="onchange" action="#{loginBean.setAuthFields(loginBean.dataTransferScheme)}"
 ajaxSingle="true" immediate="true"/>
 </h:selectOneMenu>
</h:panelGrid>
.....

<h:commandButton value="Login" action="#{login.login}"/>
</h:form>

//LoginBean.java: [the Backing bean]

public void setAuthFields(String dataTransferScheme)
{
 System.out.println("dataTransferScheme : "+dataTransferScheme);
}

I appreciate any suggestions, feedback

TIA
Ravi