How can I create tree menu (like windows explorer) in Portlet

On my page I need a portlet which will be a tree menu (expandable and collapsable).Items in the menu are just URLs.
EG: Main menu
SubMenu1
-Item11
-Item12
-Item13
Submenu2
-Item21
-Item22
-Item23
I crated a menu portlet in 9iAS portal R2, But it is not able to expand or collaps inside the same region.
When I clik on Submenu1 it open a new window and Items are dispayed on window. I do not want that, I need to see all items in a submenu at the portal region itself, then when I clik on that Item(URL) I wiil get that new page/file as per the URL.
On the menu portel design/layout screen of Oracle9iAS portal, it looks good (with exand/collaps), I want the exact same functionality for the menu on my page region.
Please give me a quick answer

Hi,
This is not possible with Portal right now. You can run the menu as a tree by clicking on the frame view icon at runtime of the menu in the full page mode. This is not possible on the page.
Thanks,
Sharmila

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