I like the left menu style on this page:
https://developers.google.com/closure/utilities/docs/linter_howto .
If you click on the left arrow, it will drop down the folder.
Is this code included in the Google Closure library for the menu? I tried searching for it but couldn't find anything.
In the closure library under closure/goog/demos there is a file index.html. Under trees there is a tree control. You might want to fiddle with the css to make it look nicer but that's basically the code.
Did you look Zippy (goog.ui.Zippy)
http://closure-library.googlecode.com/git/closure/goog/demos/zippy.html
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