It still prints the message when I press ? inside the entry. The following works for me, though: 
#!/usr/bin/perl
use warnings;
use strict;

use Tk;

my $mw = MainWindow->new->geometry("100x100+799+336");

my $entry = $mw->Entry( -text => '',
                        -width => 20
)->pack();
$entry->bind('<KeyRelease-question>' => sub { Tk->break });
$mw->bind(   '<KeyRelease-question>' => sub { print "? was pressed!\n"
+ });
$mw->Entry->pack;

MainLoop();

[download]

($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,

[download]

In reply to Re^2: Tk preventing a char in Entry widged to trigger a KeyBinding by choroba
in thread Tk preventing a char in Entry widged to trigger a KeyBinding by Discipulus

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