how to keep rich faces tree expanded if we are navigating to one jsf page and coming back

<rich:treeModelRecursiveAdaptor roots="#{item3.terminations}"
                                    nodes="#{item3.terminations1}">

#{item3.terminationName}

i am using this tag to display tree

i have a requirement where if i am going to next page and coming back from that page the tree should not collapse

which attribute i can use to achieve this feature

<h:commandButton type="image" id="backbuttonEms"
    value="#{bsmPortalLabel['button.common.back']}"
        action="viewInventory.xhtml?faces-redirect=true"
        image="/resources/images/back.png"
        immediate="true" >  

above code is for redirecting to previous page where tree should be expanded