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dynamic tree node in richfaces with ajax

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hi everyone
I'm a beginner in richfaces and I need some help.
I wanna make a tree which its TreeNode s (leaves) are added incrementaly by clicking on them with ajax technology.
I used this code but I didn't see any reply
<rich:tree style="width:300px" value="#{yegan.tree}" binding="#{yegan.htmlTree}" var="item" >
<rich:treeNode changeExpandListener="#{yegan.changed}">
<h:outputText value="#{}"/>
I would be very thankful to you
thanks and regards
Hamidreza Maghbooli
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