$ ack EnterFocus ~/perl5/lib/perl5/
/home/choroba/perl5/lib/perl5/x86_64-linux-thread-multi/Tk.pm
703:sub EnterFocus
720: $widget->bind('all','<Enter>','EnterFocus');

/home/choroba/perl5/lib/perl5/x86_64-linux-thread-multi/Tk/Menu.pm
999: # $menu->bind('<Enter>','EnterFocus');

/home/choroba/perl5/lib/perl5/x86_64-linux-thread-multi/auto/Tk/EnterFocus.al
6:#line 693 "blib/lib/Tk.pm (autosplit into blib/lib/auto/Tk/EnterFocus.al)"
17:sub EnterFocus
26:# end of Tk::EnterFocus

/home/choroba/perl5/lib/perl5/x86_64-linux-thread-multi/auto/Tk/autosplit.ix
21:sub EnterFocus 

/home/choroba/perl5/lib/perl5/x86_64-linux-thread-multi/auto/Tk/.packlist
483:/home/choroba/perl5/lib/perl5/x86_64-linux-thread-multi/auto/Tk/EnterFocus.al

/home/choroba/perl5/lib/perl5/x86_64-linux-thread-multi/auto/Tk/focusFollowsMouse.al
10: $widget->bind('all','<Enter>','EnterFocus');