Collapsing Nodes of DTN

Hi,
My requirement for customizing DTN is as below:
When the user clicks on any node in the DTN, all other open nodes except the parent node should close.
For instance:
Node A
--child node A1
--child node A2
Node B
--child node B1
--child node B2
When the user clicks on Node A, node B if open should close.
When the user clicks on Node A1 ; node A2(if open) should close and node A should continue to remain open. Node B if open should also close
I tried using the tag - <nav:navNodeParent navNode="myParentNode"> . However, I keep getting a Null pointer Exception.
Code used:
<nav:launchedNavNode navNode="myNode"> <nav:navNodeParent navNode="myParentNode">
</nav:navNodeParent >
</nav:launchedNavNode>
Requesting to help with this requirement.
Regards,
Gaurav Narkar.

Hi Srikanth,
I am trying to modify this par. I have accomplshed the closing of all other parent nodes when opening a specific parent node.
However, when i try to click on a child node , its own parent gets closed and I am not able to view this node.
I tried using the tag - <nav:navNodeParent navNode="myParentNode"> , but i get exception beacuse of the navNode attribute.
Any idea on how to resolve this issue ?
Regards,
Gaurav.

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Collapsing Nodes of DTN

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