[yuhong]

Yea, the sad thing is that, for example, back in the day Viola had built-in support for collapsible lists:

http://groups.google.com/group/alt.html/msg/ddc97911c2f9a6f4

http://groups.google.com/group/comp.infosystems.www.authorin...

http://groups.google.com/group/comp.infosystems.www.authorin...