Kevin Smith wrote:

>> 4) No way of extending the set through Ruby
> 
> I'm not sure what you mean by this. You can certainly
> subclass any of the existing widgets in Ruby.

and

Takaaki Tateishi wrote:

> Could you show me details or an example of "extending the set"?
> If I don't misunderstand, I think there are some way to extending
> widget classes now.
> If you can see samples in the archive, samples/sample6.rb would
> show you how to extending widgets.

I was thinking, in particular, of extending List to create a tree browser, 
or a list table... but I retract the statement.  I may be wrong.

--- SER