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

my @choice = sort qw/Foo Bar Baz Red Green Blue Orange White Black/;
my $chosen;

my $mw = MainWindow->new();
$mw->Label( -text => 'Pick/type a value from JComboBox:' )->pack();
my $cb = $mw->JComboBox(
    -width        => 15,
    -textvariable => \$chosen,
    -choices      => \@choice,
    -maxrows      => 5,
    -mode         => 'editable',
    -validate     => 'match',
    -relief       => 'sunken',
)->pack();
$mw->Label( -text => 'or just push this button:' )->pack();
$mw->Button(
    -text    => 'Make a random choice',
    -command => sub {
        my $c = int( rand( scalar @choice ) );
        print "$choice[$c] chosen at random\n";
        $chosen = $choice[$c];

        # uncomment the next line to fix errant JComboBox popup:
        #                              $cb->hidePopup();
    }
)->pack();

MainLoop;
[download]