I'm somewhat biased :-), but I would use Tk. Why? Because the coding is simpler, and the number of libraries needed is far less. Do a strace or ltrace on a Perl/Tk script, then on a Wx, Gtk, or Qt script, and you will see what I mean. Some toolkits load many 10's of un-needed libraires, just to display a window and a few widgets.

As a quick solution, you could use Tk::ExecuteCommand, here is a fairly complete example.

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

my %commands = (
  #buttontext => command
        sleep => 'sleep 20',
        dir   => 'dir',
        date  => 'date',
        date1 => 'date; sleep 5; date;',
    ls    => 'ls -la',
        users => 'cat /etc/passwd',
        who   => 'who',
       whomai => 'whoami',
        ps    => 'ps mauxww',
        top   => 'top',
    cat_error => 'cat foobar'
);

my $width = 90;
my $height = 120;

my $mw = MainWindow->new();
$mw->geometry($width.'x'.$height.'+100+100');
$mw->configure(-background => 'black');

$mw->Button(-text => 'Quit',
            -activebackground => 'red',
            -highlightbackground => 'yellow',
        -background => 'pink',
            -command=> sub{Tk::exit} )->pack;

my $p = $mw->Scrolled('Pane', -scrollbars => 'oe',)->pack;

foreach my $key (keys %commands){

   $commands{'tl'}{$key} = $mw->Toplevel(-background => 'lightsteelblu
+e');
           $commands{'tl'}{$key}->title($key);
           
   $commands{'ec'}{$key} = $commands{'tl'}{$key}->ExecuteCommand(
      -background => 'lightsteelblue',
      -command    => $commands{$key},
      -entryWidth => 50,
      -height     => 10,
      -label      => '',
      -text       => 'Execute',
            )->pack;

   my $t = $commands{'ec'}{$key}->Subwidget( 'text' ); # ROText widget
   $t->configure(-background => 'lightyellow');
   
     my $f1 = $commands{'tl'}{$key}->Frame(-background => 'black')
                        ->pack(-expand => 1, -fill => 'x');

    $f1->Button(-text => "Clear",
           -activebackground => 'lightyellow',
           -highlightbackground => 'white',
           -background => 'yellow',
           -command => sub { 
                 $t->delete( '1.0' => 'end' );
         })->pack(-side =>'left', -padx => 70);
          

    $f1->Button(-text => "Get Status",
           -activebackground => 'lightgrey',
           -highlightbackground => 'white',
           -background => 'grey',
           -command => sub { 
      my @return = $commands{'ec'}{$key}->get_status;
      #Returns a 2 element array of $? and $! from last command execut
+ion.
      $t->insert( 'end' => "\nStatus->\t\$?=$return[0]\t\$!=$return[1]
+\n\n");
      $t->see('end'); 
      })->pack(-side =>'left', -padx => 70);
 
    $f1->Button(-text => "Close",
           -activebackground => 'hotpink',
           -highlightbackground => 'white',
           -background => 'pink',
           -command => sub { $commands{'tl'}{$key}->withdraw;
                       $commands{'button'}{$key}->
                     configure(-state => 'normal');
             })->pack(-side => 'right', -padx => 70);
   
   $commands{'tl'}{$key}->withdraw;
 
 
   $commands{'button'}{$key} = $p->Button(-text => $key,
            -background => 'lightyellow',
        -activebackground => 'yellow',
            -command=>[\&execute, $key, ] )
                ->pack(-fill => 'x',-expand => 1,-pady => 1);
  }

MainLoop;

sub execute {
    my $key = shift;
 
   $commands{'button'}{$key}->configure(-state => 'disabled');
 
   $commands{'tl'}{$key}->deiconify;
   $commands{'tl'}{$key}->raise;

   $commands{'ec'}{$key}->bell;
   $commands{'ec'}{$key}->update;
 
}
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