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Question  posted by askman on Jun 17, 2008 08:17
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How to restore dhtmlxTree opened nodes when user comes back to the page?

Answer posted by Support on Jun 17, 2008 09:39
You can store state of nodes in cookies
    http://www.dhtmlx.com/docs/products/dhtmlxTree/samples/initialization_general_settings/pro_cookies.html

to save open state
    tree.saveOpenStates()

to load open state
    tree.loadOpenStates()