I also tested the code on Mac OS X and Linux (Ubuntu AMD64) and got the same result. <div class="gmail_quote">On Sun, Jan 18, 2009 at 1:22 PM, Doug Williams <<a href="mailto:m.douglas.williams@gmail.com">m.douglas.williams@gmail.com</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">I am trying to use a shortcut for a checkable menu item and I don't understand the behavior. Consider the following trivial gui program. #lang scheme/gui (define the-frame   (instantiate frame%     ("Test")     (min-width 100)     (min-height 100))) (define the-menu-bar   (instantiate menu-bar%     (the-frame))) (define the-test-menu   (instantiate menu%     ("&Test" the-menu-bar))) (define the-checkable-menu-item   (instantiate checkable-menu-item%     ("&Check" the-test-menu)     (callback      (lambda (checkable-menu-item event)        (printf "is-checked? = ~a~n"                (send checkable-menu-item is-checked?))))     (shortcut #\C))) (send the-frame show #t) If I select the check menu item with the mouse or with the alt keys (alt-T, alt-C in this case), it toggles and prints as expected. If I select it using the shortcut key (cntl-C in this case), the callback runs but the value isn't toggled. Is this the 'correct' behavior? [If so, I assume I need to check the event type and toggle the check myself.] I'm running Version 4.1.3.900 (4.1.4 prerelease candidate) on Windows XP. Thanks, Doug </blockquote></div>