-validatecommand => [\&Validate_Number, $entry_limit]

##</code><code>##

my %entry =(
  1=>{ 'object' =>undef,
           'upperlim => 42,
           'lowerlim  =>0
         },
  
   2=>{ 'object' =>undef,
           'upperlim => 99,
           'lowerlim  =>-23
         },
);

##</code><code>##

-validatecommand => [\&Validate_Number, 1]

##</code><code>##

#!/usr/bin/perl
use strict;
use Tk;

my $mw = MainWindow->new;

for(0..4){
$mw->Button(-text => "Hello World$_",
                     -command=>[\&change])->pack;
}
MainLoop;

sub change {
print "sub-input->@_\n";
my $caller = $Tk::widget;
print "$caller   ";
print $caller->{'_TkValue_'},'     ';
my $text = $caller->cget('-text');
print "$text\n";
$caller->configure(-text=>"Hello Stranger");
}