Alrighty, try this:

#!/usr/bin/env perl

use strict;
use warnings;
use Curses::UI;

my $cui = new Curses::UI(
                         -color_support => 1,
                        );  

my $window = $cui->add(
                       "main_window",
                       "Window",
                       -width  => 70, 
                       -height => 4,
                      );  

my $text_editor = $window->add(
                               "description_text",
                               "TextEditor",
                               -text         => "", 
                               -title        => "Enter Description",
                               -border       => 1,
                               -singleline   => 1,
                               -width        => 40, 
                               -bfg          => "red",
                               -titlereverse => 0,
                               -showlines    => 1,
                               -x            => 0,
                               -y            => 0,
                              );  

my $okay_button = $window->add(
                               "buttons",
                               "Buttonbox",
                               -border  => 1,
                               -width   => 6,
                               -bfg     => "blue",
                               -x       => 40, 
                               -y       => 0,
                               -buttons => [
                                            {   
                                             -label => "Okay",
                                             -value => 1,
                                             -shortcut => "o",
                                             -onpress  => sub {
                                                              $cui->le
+ave_curses();
                                                              print "O
+utside of mainloop!\n";
                                                              sleep(2)
+;
                                                              $cui->re
+set_curses();
                                                          },
                                            },  
                                           ],  
                              ); 

my $exit_button = $window->add(
                               "exit",
                               "Buttonbox",
                               -border  => 1,
                               -width   => 6,
                               -bfg     => "blue",
                               -x       => 46, 
                               -y       => 0,
                               -buttons => [
                                            {   
                                             -label => "Exit",
                                             -value => 1,
                                             -shortcut => "x",
                                             -onpress  => sub { $cui->
+mainloopExit; },
                                            },  
                                           ],  
                              ); 
                               
 
$text_editor->focus;
$cui->mainloop;
[download]

Now, using the Okay button flashes you to the terminal for a couple seconds to see the output of print and then goes back to Curses.

Hope this helps

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