checklistbox widget?

[Vadim Zeitlin <zeitlin dptmaths ens-cachan fr>]

 Hello,

 I'd like to implement a "checklistbox" widget with GTK: this is
something like a normal listbox (i.e. it shows a column of items
with scrollbar possibly), but each item has a checkbox at its
left.

 Of course, I wouldn't like to write it from scratch, but rather
somehow use existing listbox and checkbox widgets, however I don't
really know how to do it. What's the best (or just any :-) way
to combine them together?

 Thanks in advance,
VZ