Train button bar text

Question

I have a requirement where i need to show train at the top of the page (always) and
train button bar at the bottom of the page with following requirements
1. only back button, renamed to Previous if next is disabled, i.e for the last train stop
2. only next renamed to Continue, if back is disabled i.e for the first stop
3. both back renamed to Previous and next renamed to Continue for all other train stops
for train at the top i used,
<af:train id="t1" var="trainNode"
value="#{controllerContext.currentViewPort.taskFlowContext.trainModel}">
<f:facet name="nodeStamp">
<af:commandNavigationItem text="#{trainNode.textAndAccessKey}" id="cni2"
visited="#{trainNode.visited}"
disabled="#{trainNode.disabled}"
action="#{trainNode.action}"
immediate="#{trainNode.visited}"></af:commandNavigationItem>
</f:facet>
</af:train>
-- it is working fine
for the train button bar, when i use
<af:trainButtonBar id="tr_tbb1" var="trainNode"
value="#{controllerContext.currentViewPort.taskFlowContext.trainModel}">
<f:facet name="nodeStamp">
<commandButton text="Previous" id="cnsdi2" // or <af:commandNavigationItem
disabled="#{trainNode.disabled}"
action="#{trainNode.action}"
immediate="#{trainNode.visited}"/>
</f:facet>
</af:trainButtonBar>
I never see the text getting update even if i hard-code,
How do i acheive this ??
thanks

Answer 1

My requirement is to
1. display only back button( renamed to Previous) at the last train stop. Next Button (renamed to Continue) should not be rendered at all
2. display only next button (renamed to Continue) at the first train stop , back button( renamed to Previous) should not be rendered at all
3. both back renamed to Previous and next renamed to Continue for all other train stops