slaven rezic tqcsubrezicde hmerijn brand writes big application reduced test case maybe even shorter reduce perl use tk top new mainwindow topcheckbutton variable tarpack topbuttoncommand sub tar bless foo topdestroy pack mainloop __end__ error occurs line strcmpvalue tcl_getstringbutptronvalueptr 0 butptronvalueptr 0 guess kind destruction cleanup occured tk tried access checkbutton value last time suggest use variable checkbutton flag blessed object regards slaven slaven rezic slaven rezic de tkruler perltk program measuring screen distances httpptktoolssourceforgenettkruler thu 07 aug 2008 014107 0200 archivetar tk dont play nice together