use Tk;
use warnings;
use Tk::CaptureRelease;

use Data::Dumper (Dumper);

my $mw = MainWindow->new;
my $f = $mw->Frame->pack(-fill => 'both',
                          -expand => 1,
                          -anchor => 'nw',
                          -side => 'top');
my $l = $mw->Label(-text => 'Main Widget has been "popped"');
my $sf = $f->Frame;
my $e = $sf->Entry->pack(-fill => 'x',
                          -expand => 1);
my $b = $mw->Button(-command => 'main::popup',
                     -text => 'Pop-Up')->pack;

my $popped = 0;
$sf->pack(-fill => 'both',
           -expand => 1);
          
	   
#$sf->can('_wmRelease') && print ("can _wmRelease\n");
#$sf->can('wmRelease') &&  print ("can wmRelease\n");

*Tk::Widget::wmRelease = \&Tk::_wmRelease;
#$sf->wmRelease;
#$mw->wm('tracing', 1);

sub popup {
   print "sf is mapped ".$sf->ismapped."\n";
   if ($popped) {
     #$l->packForget;
     #$sf->packForget;
     
     print "Capturing\n";
     $sf->wmCapture;
     print "Captured\n";
     $sf->pack(-in => $f,
               -fill => 'both',
               -expand => 1);
     print "Packed\n";
     print "sf is mapped ".$sf->ismapped()."\n";
     print "sf geometry ".$sf->geometry()."\n";
     print "sf id".$sf->id()."\n";
     print "sf Exists ".$sf->Exists()."\n";
     $mw->update;
     $popped = 0;
   } else {
     print "Before Release toplevel = ".$sf->toplevel()."\n";
     print "Before Release toplevel id = ".$sf->toplevel()->id."\n";
     
     my $wrapper = $sf->toplevel()->wrapper;
     if( ref($wrapper)){ # dump to string, if ref
     	$wrapper = Dumper($wrapper);
     }
     print "Before Release toplevel wrapper = ".$wrapper."\n";
 
     $sf->packForget;
     $sf->wmRelease;
     $sf->raise;
     $sf->MainWindow::deiconify; # ARGH!
     
     print $sf."\n";
     print "toplevel = ".$sf->toplevel()."\n";
     print "toplevel id = ".$sf->toplevel()->id."\n";
     print "sf is mapped ".$sf->ismapped()."\n";
     print "sf geometry ".$sf->geometry()."\n";
     print "sf id".$sf->id()."\n";
     print "sf state ".$sf->MainWindow::state()."\n";

     $wrapper = $sf->MainWindow::wrapper;
     if( ref($wrapper)){ # dump to string, if ref
     	$wrapper = Dumper($wrapper);
     }
     print "sf wrapper = ".$wrapper."\n";
 
     #$sf->pack;
     $popped = 1;
   }
} 

MainLoop;