>R.R. Software, http://www.rrsoftware.com/ provides an Ada binding
  There's also our TriAda paper on Windows and Ada at that site, as
well as a $0 version of Claw, with sample programs.  The $>0 version
of Claw comes with 100 pages of (paper) manual (not counting 25 for
the GUI Builder), much of which is sample programs incorporating
successively more features (like Petzold).