How to expand or collapse the tree using node level.

Hi All,
I have 4 node levels in tree including the root at node level 0.
If i click on node level1 for instance ,all the node level 1 should be expanded or collapsed.
Only the root and and nodes at level 1 should be visible to the user.
Can anybody pls help me to achive this functionality.
Thanks,
SRhodes.

In the portal i can see something like a group with this property, but i can't find the component where is used this...
You can see it in this [Screenshot|http://www.imaxenes.com/imagen/screenshot1de13a5.jpg.html]
Wich type of UI Element can i use for do it ?
Thanks !

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