The button font for tix8.1.4 demos program are so mall that I can
not spell the text , to solve this problem , I must down grade to
tix8.1.1 ???


I correct my Example :
% frame .f
% button .f.b -text aa -command "echo aa"
% set balloonHelp [tixBalloon .help_balloon]
% $balloonHelp bind .f.b -balloonmsg "Press will echo aa"
% pack .f.b
% pack .f