dataGrid and datascroller inside modal panel : no scrolling

[pdpantages]

Hello Forum,

I am using:
Jboss 4.2.2.GA
Seam 2.0.1.GA
Richfaces 3.1.6.GA

I am trying to use a dataGrid inside a modal panel. I have basically copied the mo from the richfaces demo site.
I found that everthing is OK, except that the pager ( dataScroller ) does not work in Firefox 3.0 or IE 7. When you click the right arrow, or the number 2, it stays on page 1.

Firefox 2.x works as expected.

When I click the pager button, the FF3 error console emits the following message:

Error: this._form is null
Source File: http://172.30.0.204:8080/client/a4j_3_1_6.GAorg.ajax4jsf.javascript.AjaxScript
Line: 95

This is my xhtml:

 <ui:composition xmlns="http://www.w3.org/1999/xhtml"
 xmlns:ui="http://java.sun.com/jsf/facelets"
 xmlns:h="http://java.sun.com/jsf/html"
 xmlns:f="http://java.sun.com/jsf/core"
 xmlns:s="http://jboss.com/products/seam/taglib"
 xmlns:rich="http://richfaces.org/rich"
 xmlns:c="http://java.sun.com/jstl/core"
 xmlns:a4j="http://richfaces.org/a4j"
 xmlns:centina="http://www.centinasystems.com/jsf">

 <c:if test="${empty onhide}">
 <c:set var="onhide" value="return;" />
 </c:if>

 <c:if test="${empty onshow}">
 <c:set var="onshow" value="return;" />
 </c:if>

 <rich:modalPanel id="#{modalPanel}"
 autosized="true"
 zindex="2000"
 onhide="${onhide}"
 onshow="${onshow}"
 rendered="#{rendered}"
 onmaskclick="javascript:Richfaces.hideModalPanel('#{modalPanel}')">

 <f:facet name="header">
 <h:outputText value="Location xxx yyy "></h:outputText>
 </f:facet>

 <h:form id="locus">

 <rich:dataGrid value="#{neAction.nes('id')}" var="node" columns="4" elements="16">

 <rich:panel>

 <h:panelGrid columns="1">
 <ui:include src="/view/utils/toolicon.xhtml">
 <ui:param name="src" value="#{images.networkElement}"/>
 <ui:param name="alt" value="Ne"/>
 </ui:include>
 <h:outputText value="#{node.name}" style="max-width: 10em;"></h:outputText>
 </h:panelGrid>

 <rich:contextMenu event="oncontextmenu" attached="true" submitMode="ajax">

 <rich:menuItem value="Active Alarms"
 rendered="#{s:hasRole('READ_ONLY') || s:hasRole('OPERATOR') || s:hasRole('NETWORK_ADMIN') || s:hasRole('ADMIN')}"
 onclick="javascript:Richfaces.hideModalPanel('#{modalPanel}')"
 action="#{activeAlarmsImpl.activeAlarms}">
 <s:conversationPropagation type="none"/>
 <f:param name="id" value="#{node.id}"/>
 </rich:menuItem>

 <rich:menuItem value="Security Log" rendered="#{s:hasRole('ADMIN')}"
 onclick="javascript:Richfaces.hideModalPanel('#{modalPanel}')"
 action="#{securityLogImpl.contextSearch}">
 <s:conversationPropagation type="none"/>
 <f:param name="searchString" value="#{node.name}"/>
 <f:param name="searchCol" value="targetName"/>
 </rich:menuItem>

 </rich:contextMenu>

 </rich:panel>

 <f:facet name="footer">
 <rich:datascroller></rich:datascroller>
 </f:facet>

 </rich:dataGrid>

 </h:form>

 </rich:modalPanel>

 </ui:composition>

Any help/ideas will, as usual, be appreciated...

Thanks, PdP