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

use Tk;
use Tk::Pane;

my $mw = new MainWindow ();
$mw->title(" $0 MAIN");
my $phwin = $mw->Toplevel();

my $fr0 = $mw->Frame(-borderwidth => 2, -relief => 'groove'
      )->pack();
    $fr0->Label(-text => "MAIN $0 MAIN"
      )->pack();

&secondary_win;
MainLoop;

################################################################################
sub secondary_win {
    # window does not exists
    if (! Exists($phwin)) {
      $phwin = $mw->Toplevel();
      $phwin->title("SECONDARY");
    }
    # window Exists
    else {
      $phwin->deiconify( ) if $phwin->state() eq 'iconic';
      $phwin->raise( ) if $phwin->state() eq 'withdrawn';
    }
    my $scrolledframe = $phwin->Scrolled('Frame',-scrollbars => 'osoe')->pack();

    my $sec_label = $scrolledframe->Label(-text=>'SECONDARY')->pack;

}