use strict;
use warnings;

use Tk;

my $mw = MainWindow->new;

my $top = $mw->Frame->pack(-side => 'top');
my $bottom = $mw->Frame->pack(-side => 'top');

my $entryCount = $top->Entry(
   -width => 2
)->pack(-side => 'left');

$top->Button(
   -text => "Create Entries",
   -command => [\&createEntries, $entryCount, $bottom]
)->pack(-side => 'left');

$top->Button(
   -text => "Print Contents",
   -command => [\&printContents, $bottom]
)->pack;

MainLoop;

sub createEntries
{
   my ($entry, $frame) = @_;
  
   my $count = $entry->get();
   return unless $count && $count =~ /^\d+$/;

   foreach my $row (1 .. $count) {
      $frame->Label(
         -text => "Entry $row:",
         -anchor => 'w'
      )->grid( 
         $frame->Entry(-width => 20)
      );
   }
}
 
sub printContents
{
   my $frame = shift;
   my $count = 1;
   foreach my $w ($frame->children) {
      printf "Entry %d: %s\n", $count++, $w->get() if
         ref($w) eq 'Tk::Entry';
      $w->destroy;
   }
   print "\n";
}