<code>
....your code here
</code>
[download]

#!/usr/bin/perl
use warnings;
use strict;
use Tk;
use Tk::FileSelect;

my $mw = MainWindow->new;

$mw->configure( -background => 'black', -foreground => 'white' );
$mw->geometry( "400x100" );
$mw->title( "Multiple Windows Test" );

my $button1 = $mw->Button(
   -text       => "view Results",
   -background => "cyan",
   -command    => \&button1_sub
)->pack( -side => "right" );

$mw->Button( -text => "Exit", -command => sub { exit } )
 ->pack( -side => "bottom" );

sub button1_sub {
   my $subwin1 = $mw->Toplevel;
   $subwin1->geometry( "500x400" );
   $subwin1->title( "Sub Window #1" );
 
   my $fh;
  open( $fh, '+<', "./$0" ) or die $!;  #just open script for test
   my @contents = <$fh>;
#   print "@contents\n";
   close( $fh );

  my $sublable = $subwin1->Scrolled( 'Text', -scrollbars => 'osoe', )-
+>pack;
  $sublable->insert( 'end', @contents );

 my $subwin_button = $subwin1->Button(
      -text    => "Close window",
      -command => sub {$subwin1 => 'destroy'}
    )->pack( -side => "bottom" ); 

#=================Creating save buttion on subwindow =========== 

my $save_button = $subwin1->Button(-text=>'save', 
   -command =>\&get_save, -background =>'cyan')->pack(-side=>'right');
+ 

} 

MainLoop; 

#sub get_save{

# getSaveFile(-title => 'Select a file to APPEND',-defaultextension=>'
+.in'); 

#}


sub get_save { 

        my $dst  = $mw->getSaveFile(
            -initialdir       => $ENV{HOME},
            -defaultextension => '.in',
             -title            => 'Save',
            -filetypes        => [
                [ 'myfiles'    => '.in' ],
                [ 'All files' => '*'    ],
            ],
        );

      $dst ||= '<undef>'; 
      warn "dst=$dst";
}
[download]

Thank you very much for helping me, one more issue , the using above mentioned code I am not able to "save" the changes which are made by the user , how can i save the changes ........

Thanks for replay, I am facing problem here , ...

I am facing problem too! Please read Writeup Formatting Tips. I may be able to help but there's no way I'm going to attempt to wade through the mess you've currrently posted. Fix it up and I'll take a look. :-)

Hi please have a look on it, this is my code , here iam able to open the file but i can't save the changes , can you help me how can i do it.

#!/usr/bin/perl -w
# Create a sub window at the request of the user

use Tk;
use strict;

my $mw = MainWindow->new;
$mw->configure(-background => 'black',
                -foreground => 'white');
$mw->geometry("400x100");
$mw->title("Multiple Windows Test");

my $button1 = $mw->Button(
                        -text => "view Results",
                        -background => "cyan",
                        -command => \&button1_sub)->pack(-side=>"right
+");
                      $mw->Button(-text => "Exit", -command => sub{exi
+t})->pack(-side=>"bottom");

sub button1_sub {
                my $subwin1 = $mw->Toplevel;
                $subwin1->geometry("400x300");
                $subwin1->title("Sub Window #1");
                my $fh;
                open ($fh,"<test.txt") or die $!;
my @contents = <$fh>;
                my $sublable = $subwin1->Scrolled('Text',
                                                -scrollbars => 'osoe',
                                                )->pack;
                $sublable->insert('end',@contents);
                close($fh);
                my $subwin_button = $subwin1->Button(-text => "Close w
+indow",
                -command => [$subwin1 => 'destroy'])->pack(-side=>"bot
+tom");

                #=================================Creating save buttio
+n on subwindow ===========

                my $save_button = $subwin1->Button(-text=>'save',
                                                -command =>\&get_save,
                                                -background =>'cyan')-
+>pack(-side=>'right');

}

MainLoop;

sub get_save {
                getSaveFile(-title => 'Select a file to APPEND',-defau
+ltextension=>'.in');
}
[download]