I tried to make Ajax requests inside rich:modalPanel, but had no success. Any hint is appreciated!

The modal panel is defined as follows:

<rich:modalPanel id="detailModalPanel2" width="400" height="300">
 <f:facet name="header">
 <h:outputFormat id="detailModalTitle2" value="#{i18n['modalPanel.details.title']}">
 <f:param id="detailModalTitleId2" value="#{kunde.id}"/>
 </h:outputFormat>
 </f:facet>
 <f:facet name="controls">
 <h:panelGroup>
 <h:graphicImage id="closeDetailModalPanel2" value="/images/close.png" style="cursor:pointer" alt="#{i18n['modalPanel.button.close']}"/>
 <rich:componentControl for="detailModalPanel2" attachTo="closeDetailModalPanel2" operation="hide" event="onclick"/>
 </h:panelGroup>
 </f:facet>

 <a4j:include viewId="/kundenverwaltung/modalPanel.details2.xhtml" />
</rich:modalPanel>

<h:outputLink id="openDetailModalPanel2" value="#">
 <h:graphicImage id="detailsIcon" url="/images/details2.gif" alt="#{i18n['modalPanel.button.details2']}"/>
 <rich:componentControl for="detailModalPanel2" attachTo="openDetailModalPanel2" operation="show" event="onclick"/>
</h:outputLink>

The included file for the modal panel is a tabPanel. However, if I click on the 2nd tab, then nothing happens. If I change switchType to "client", then everything works fine.

<a4j:form id="tabPanelForm">
 <rich:tabPanel id="tabPanel" switchType="ajax">
 <rich:tab id="stammdatenTab">
 <f:facet name="label">
 <h:panelGroup>
 <h:graphicImage value="/images/stammdaten.gif"/>
  
 <h:outputText value="#{i18n['panelGridDetails.kunde.stammdaten']}" />
 </h:panelGroup>
 </f:facet>
 <h:panelGrid id="ausgewaehlterKunde" columns="2">
 ...
 </h:panelGrid>
 </rich:tab>

 <rich:tab id="bestellungenTab" rendered="#{not empty kunde.bestellungen}">
 <f:facet name="label">
 <h:panelGroup>
 <h:graphicImage value="/images/bestellungen.gif"/>
  
 <h:outputText value="#{i18n['tabelle.kunde.bestellungen']}" />
 </h:panelGroup>
 </f:facet>
 <h:dataTable id="bestellungenTabelle"
 value="#{kunde.bestellungen}"
 var="bestellung">
 <rich:column>
 <rich:simpleTogglePanel label="#{i18n['bestellung']} #{bestellung.id}"
 opened="false"
 width="100%"
 heigth="100%"
 switchType="client">
 <rich:dataTable id="bestellungTabelle"
 value="#{bestellung.bestellpositionen}"
 var="bp">
 <rich:column>
 <f:facet name="header">
 <h:outputText value="#{i18n['bestellung.anzahl']}"/>
 </f:facet>
 <h:outputText value="#{bp.anzahl}"/>
 </rich:column>
 <rich:column>
 <f:facet name="header">
 <h:outputText value="#{i18n['bestellung.artikel']}"/>
 </f:facet>
 <h:outputText value="#{bp.artikel.bezeichnung}"/>
 </rich:column>
 </rich:dataTable>
 </rich:simpleTogglePanel>
 </rich:column>
 </h:dataTable>
 </rich:tab>
 </rich:tabPanel>
</a4j:form>