text from GList item?

[Paul Emsley]

I want to get to the text/string of the list of items in a combo-box:
So, it is not clear to me what I should substitute for xxx in the
following... can you help?

    (let ((combo-list (gtk-combo-list my-combo-box)))
      (let ((children (gtk-container-children combo-list)))
        (map (lambda (c) (format #t "~s~%" (xxx c)))
             children)))

Cheers, 

Paul.