>     >     How do you think including tree-widget developed by David PONCE 
>     >     in emacs official distribution?
>     > 
>     > Could you explain to me what that does?
> 
>     As the name explains, the code provides widget
>     representing a tree hierarchy like:
> 
> It sounds quite useful.  Could you post the code here
> so that people can look at it?

I attached .tar.gz file got from
http://sourceforge.net/project/showfiles.php?group_id=79309&package_id=81112

I would like David PONCE to explain the cutting edge version if such a 
version is existing.

Masatake YAMATO