Keeping expended leaf node when reloading page for TreeNodeType

Hi all,
My page with context is:
-TREE (node)
---TREENODE (node)
CHILDNODE (node)
name (attribute)
value (attribute)
I map this context into TREE as below:
-TREE (element type: TREE; dataSource : TREE)
---TNT_NODE (element type: TreeNodeType; dataSource: TREENODE; hasChildren: TRUE )
---TNT_CHILDNODE (element type: TreeNodeType; dataSource: CHILDNODE; hasChildren: FALSE)
Everything is ok, but my issue is:
How TNT_NODE keep expanded (show child node as TNT_CHILDNODE) when page is reloaded? Now TNT_NODE collapse its leaf node when page reload. I tried using EXPANDED but it expands all nodes that is not my desire.
Please give me your advice.
Regards,
Ken

my issue is resolved

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