Hi all,
first of all sorry, but I didn't know a better title.

#!/usr/bin/perl -w

use Tk;

my $mw =MainWindow ->new;

$mw -> title ("Untitled");

$mw -> Button(-text => "S H O W", -command => \&show)->grid(-row => 0,
+ -column => 0);

$mw -> Button(-text => "E X I T", -command => sub {exit})->grid(-row =
+> 0, -column => 1);

$lb2 = $mw -> Scrolled('Listbox', -width=> 30, -height => 10, -selectm
+ode => "single", -scrollbars => 'e', -setgrid =>1, -background => 'bl
+ack', -foreground => 'white') -> grid (-row => 1, -column => 0);

MainLoop;

sub show {

   $lb2 -> delete(0,'end'); 

   open(PIPE, "du -a 2>&1 |") or die "Could not open pipe: $!\n" ;
   while (<PIPE>) {
   chop ($_) ;

   $lb2 -> insert('end',$_); }

   close(PIPE) ;
}

exit (0);
[download]

When I push the SHOW button, it's relief stays sunken and the listbox (lb2) empty.
After the while loop has finished, the button's relief is restored to its original value and the listbox is filled with data.

What needs to be changed, so the listbox gets filled "live"?
I guess the button needs to be forced to change it's state/get released?

Regards,
unknown-monk