I can post the code i found at Tk.pm and Dialog.pm: Tk.pm

sub messageBox
{
 my ($widget,%args) = @_;
 # remove in a later version:
 if (exists $args{'-text'})
  {
   warn "The -text option is deprecated. Please use -message instead";
   if (!exists $args{'-message'})
    {
     $args{'-message'} = delete $args{'-text'};
    }
  }
 $args{'-type'}    = (exists $args{'-type'})    ? lc($args{'-type'}) :
+ 'ok';
 $args{'-default'} = lc($args{'-default'}) if (exists $args{'-default'
+});
 ucfirst tk_messageBox(-parent => $widget, %args);
}
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sub Methods
{
 my ($package) = caller;
 no strict 'refs';
 foreach my $meth (@_)
  {
   my $name = $meth;
   *{$package."::$meth"} = sub { shift->WidgetMethod($name,@_) };
  }
}

my %dialog = ( tk_chooseColor => 'ColorDialog',
               tk_messageBox  => 'MessageBox',
...
[download]

sub MessageBox {
    my ($kind,%args) = @_;
    require Tk::Dialog;
    my $parent = delete $args{'-parent'};
    my $args = \%args;

    $args->{-bitmap} = delete $args->{-icon} if defined $args->{-icon}
+;
    $args->{-text} = delete $args->{-message} if defined $args->{-mess
+age};
    $args->{-type} = 'OK' unless defined $args->{-type};

    my $type;
    if (defined($type = delete $args->{-type})) {
    delete $args->{-type};
    my @buttons = grep($_,map(ucfirst($_),
                      split(/(abort|retry|ignore|yes|no|cancel|ok)/,
                            lc($type))));
    $args->{-buttons} = [@buttons];
    $args->{-default_button} = ucfirst(delete $args->{-default}) if
        defined $args->{-default};
    if (not defined $args->{-default_button} and scalar(@buttons) == 1
+) {
       $args->{-default_button} = $buttons[0];
    }
        my $md = $parent->Dialog(%$args);
        my $an = $md->Show;
        $md->destroy if Tk::Exists($md);
        return $an;
    }
} # end messageBox
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Then in Dialog.pm:

sub MessageBox {
    my ($kind,%args) = @_;
    require Tk::Dialog;
    my $parent = delete $args{'-parent'};
    my $args = \%args;

    $args->{-bitmap} = delete $args->{-icon} if defined $args->{-icon}
+;
    $args->{-text} = delete $args->{-message} if defined $args->{-mess
+age};
    $args->{-type} = 'OK' unless defined $args->{-type};

    my $type;
    if (defined($type = delete $args->{-type})) {
    delete $args->{-type};
    my @buttons = grep($_,map(ucfirst($_),
                      split(/(abort|retry|ignore|yes|no|cancel|ok)/,
                            lc($type))));
    $args->{-buttons} = [@buttons];
    $args->{-default_button} = ucfirst(delete $args->{-default}) if
        defined $args->{-default};
    if (not defined $args->{-default_button} and scalar(@buttons) == 1
+) {
       $args->{-default_button} = $buttons[0];
    }
        my $md = $parent->Dialog(%$args);
        my $an = $md->Show;
        $md->destroy if Tk::Exists($md);
        return $an;
    }
} # end messageBox
[download]