Seam - Conversation scope example - notworking - New window tab sample

HI ,

I have requirement of opening new window /tab for page flow which fits for seam conversational scope

below is code of same .. i m not sure what i am doing wrong in it. To open window ui have normal wndow.open js call. object to be shared between multiple tab is kept in conversation scope . The action before starting new tab is annotated with @Begin ... Please suggest any idea

Action class

User object which is put in conversation scope

Registration Page

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
                      "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
        xmlns:s="http://jboss.com/products/seam/taglib"
        xmlns:h="http://java.sun.com/jsf/html"
        xmlns:f="http://java.sun.com/jsf/core"
        xmlns:a4j="http://richfaces.org/a4j">
<head>
<title>Register New User</title>
</head>
<body>
<script>
        function openWindow()
                {
                         open("registered.seam","_blank","left=0,top=0, height=673, width=1014, resizable=yes, toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=no,dependent=yes");
                }
</script>
<f:view>
        <a4j:form>
                <h:panelGrid columns="2">
                  Username: <h:inputText value="#{user.username}" />
                </h:panelGrid>
                <a4j:commandLink value="Register Command Link"
                        action="#{register.register}" oncomplete="openWindow();">
                        <f:param name="conversationId" value="#{conversation.id}" />
                </a4j:commandLink>
        </a4j:form>
</f:view>
</body>
</html>

New tab/Window opens up with following page