wm protocol . WM_DELETE_WINDOW do_quit
bind all <$M1B-Key-q> do_quit
bind all <$M1B-Key-Q> do_quit
-bind all <$M1B-Key-w> {destroy [winfo toplevel %W]}
-bind all <$M1B-Key-W> {destroy [winfo toplevel %W]}
+
+set m1b_w_script {
+ set toplvl_win [winfo toplevel %W]
+
+ # If we are destroying the main window, we should call do_quit to take
+ # care of cleanup before exiting the program.
+ if {$toplvl_win eq "."} {
+ do_quit
+ } else {
+ destroy $toplvl_win
+ }
+}
+
+bind all <$M1B-Key-w> $m1b_w_script
+bind all <$M1B-Key-W> $m1b_w_script
+
+unset m1b_w_script
set subcommand_args {}
proc usage {} {