Hi, this is a good time for grid use, but I like using frames because they resize better. So here is your script rewritten using multiple frames. I used -anchor => 'w' on the first frame so you can see the difference between it and the other frames which are centered. Read Tk::pack for all the options. Notice I also added 2 spaces to your login label to make things line up. There is a Tk::LabEntry module on cpan which makes this all easier. This is doing it manually, but you learn more. :-)

#!/usr/bin/perl
use strict;                    # module to must always declare variabl
+es before you use them
use warnings;                # module to show where is the error 
use Tk;                        # module for the Windows GUI


my $mainwindow = MainWindow->new();
$mainwindow->geometry("600x150");
$mainwindow->title("Window");

# Disable the window Resize
$mainwindow->resizable(0,0);

# Menu display option
my $main_menu = $mainwindow->Menu();
$mainwindow->configure(-menu => $main_menu);

#File
my $file_menu = $main_menu->cascade(-label=>"File", -underline => 0, -
+tearoff=>0);
   $file_menu->command(-label=>"New", -underline=>0, -command=>sub{exi
+t}, -state => 'disabled');
   $file_menu->command(-label=>"Exit", -underline=>0, -command=>sub{ex
+it});
   
# About
$main_menu->command(-label=>"About", -command=>sub{$mainwindow->messag
+eBox(-title=> "About", -message=>"Version 3.0.0", -type => "ok")});

# text variable
my $label_firstname;
my $entry_firstname;
my $label_lastname;
my $entry_lastname;
my $label_loginid;
my $entry_loginid;
my $button_add;

# -anchor =>  'e' | 'w' | 'n' | 's' | 'ne' | 'nw' | 'se' | 'sw' | 'cen
+ter'

#            top
################################
# nw        n         ne #
#                   #
# w        center          e  #
#                   #
# sw        s         se #
################################
#        bottom

my $firstframe = $mainwindow->Frame()->pack(-expand=>1, -anchor => 'w'
+ );

$label_firstname = $firstframe->Label(-text => 'Firstname:')->pack (-s
+ide => 'left');
$entry_firstname = $firstframe->Entry(-width => 35,-text => 'Firstname
+')->pack (-side => 'left' );

my $lnframe = $mainwindow->Frame()->pack(-expand=>1 );

$label_lastname = $lnframe->Label(-text => 'Lastname:')->pack (-side =
+> 'left');
$entry_lastname = $lnframe->Entry(-width => 35,-text => 'Lastname')->p
+ack (-side => 'left');

my $loginframe = $mainwindow->Frame()->pack(-expand=>1 );

$label_loginid = $loginframe->Label(-text => 'Login ID:  ')->pack(-sid
+e => 'left');
$entry_loginid = $loginframe->Entry(-width => 35,-text => 'loginID')->
+pack (-side => 'left');

my $buttonframe = $mainwindow->Frame()->pack(-expand=>1 );

$button_add = $buttonframe->Button(-text => 'Add New User', -command=>
+sub{exit})->pack();

MainLoop();
[download]

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