Hi Monks,
I need some help with a GUI application i have been trying to build lately. One of the major problems i'm facings is when i try to close the Top level widget by destroying it(see code) and try to reload it later, the widget don't auto load and gives me the error

Tk::Error: Failed to AUTOLOAD 'Tk::Widget::insert' at C:/Dwimperl/perl
+/site/lib/
Tk/Derived.pm line 469
 Carp::croak at C:/Dwimperl/perl/lib/Carp.pm line 100
 Tk::Widget::__ANON__ at C:/Dwimperl/perl/site/lib/Tk/Widget.pm line 3
+47
 Tk::Derived::Delegate at C:/Dwimperl/perl/site/lib/Tk/Derived.pm line
+ 469
 Tk::Widget::__ANON__ at C:/Dwimperl/perl/site/lib/Tk/Widget.pm line 3
+22
 main::push_button2 at top.pl line 62
 Tk callback for .toplevel.button1
 Tk::__ANON__ at C:/Dwimperl/perl/site/lib/Tk.pm line 251
 Tk::Button::butUp at C:/Dwimperl/perl/site/lib/Tk/Button.pm line 175
 <ButtonRelease-1>
 (command bound to event)
[download]

Please help..!! Below is the code:

#!/usr/local/bin/perl

use Tk;
require Tk::ROText;
require Tk::TextUndo;
use Carp;
use Tk::widgets qw(Canvas);
use Tk::Xlib;
use Math::Cartesian::Product;
use List::Util qw[min max];
use List::MoreUtils qw(firstidx);
 
# Main Window
my $mw = new MainWindow;
$mw->title('File preview');
$mw->scaling($ARGV[0]) if (@ARGV);
my $screen = $mw->Screen;
my $width1    = $screen->WidthOfScreen;
my $height1   = $screen->HeightOfScreen;
$mw->Frame(-background => 'red')->pack(-ipadx =>50, -side => "left", -
+fill => "y",);
#Making a text area
my $txt = $mw -> Scrolled('ROText',-width => $width1, height => $heigh
+t1, -scrollbars=>'e', -font => "fixed 10 bold") -> pack ();
$txt->insert('end', "");
#Declare that there is a menu
my $mbar = $mw -> Menu();
$mw -> configure(-menu => $mbar);
#The Main Buttons
my $file = $mbar -> cascade(-label=>"File    ", -underline=>0, -tearof
+f => 0);
my $tool= $mbar -> cascade(-label =>"Tools    ", -underline=>0, -tearo
+ff => 0);
my $parser = $mbar -> cascade(-label =>"Check    ", -underline=>0, -te
+aroff => 0);
my $help = $mbar -> cascade(-label =>"Help    ", -underline=>0, -tearo
+ff => 0);

## Tools Menu ##
$tool -> command(-label => "ABC", -underline=>0,
-command=> \&nwplan );
$tool -> command(-label => "CC", -underline=>0,
-command=> \&optimize );
$tool -> separator();
$tool -> command(-label =>"WW", -underline =>1,
-command => \&do_top);
$tool -> command(-label =>"Clear", -underline => 0,
-command => sub {$txt->delete('1.0','end');});

MainLoop;
        
        sub do_top {
  if (! Exists($tl)) {
    $tl = $mw->Toplevel;
    $tl->title('Help');
 $tl->geometry( "1000x700" );
       
    my $frame = $tl->Frame()->pack;
    my $lab = $tl->Label()->pack;
    my $ent = $tl->Entry()->pack;
    
     $tl->Button(-text => 'Exit',-command => sub { $tl->destroy;})->pa
+ck;
 $tl->Button(-text => 'Open File1',-command =>\&push_button2)->pack;
  
 my $text = $tl->Scrolled('Text')->pack();
       
  sub push_button2{
     $text->insert('end',"You pushed button2\n");}
      
  }
  else {
    $tl->deiconify;
    $tl->raise;
  }

}
[download]

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