Here is a simpler example.
#!/usr/bin/perl
use Tk;
use strict;
use warnings;
my $mw = new Tk::MainWindow;
my @array = qw(bannana boss ape);
my $checklist = 'List will go here';
$mw->fontCreate('big',
-weight=>'bold',
-size=> 24
);
foreach my $item (@array)
{
$mw->Checkbutton(
-font => 'big',
-bg => 'white',
-text=> $item,
-offvalue=>'',
-onvalue=>$item,
-variable=>\$item,
-command=>sub{$checklist="List: @array"})
->pack(-anchor=>'w');
}
$mw->Label(-font => 'big',
-textvariable=>\$checklist)->pack(-side=>'left');
MainLoop;
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