Proposition of the patch is attached.
OK, I've added this to my local tree and it will make it into CVS
before too long. Those with an interest in tk, gtk, qt might want to
consider a similar patch to those backends.
> BTW could you have a look at
> Does it makes a sense?
Sorry I didn't respond earlier -- a combination of being out of the
country in combination with a hard-drive failure have left me in
catch-up mode. Thanks for the reminder
I don't like the idea of making the label a string or None, because it
leads to code that is difficult to maintain and may break existing
code that relies on the label to be a string. I would be amenable to
using a sentinel string, such as '_nolegend_' or something like that.