[Urwid] Documentation or example on how the Signals class is used?

[Dominic LoBue]

Ian,

Are there any plans on writing up any documentation on how the Signals
class is supposed to work? Fail that, are there any examples where I
can see the class used more extensively? The doc strings for ListBox
and SimpleListWalker that suggest using Signals don't explain how to
properly use them at all.

Dominic