Instead of this being in the main part of your gui-creation code:

# Print Listbox Button 
my @filenames; 
my @selected_files = $listbox->curselection; 
for (@selected_files) { 
    my $file = $listbox->get($_); 
    push @filenames, $file; 
}
[download]

you need to put those lines into a subroutine (e.g. called "print_filenames"), and maybe change the comment to read "Callback function for the "Print Listbox Button".

Then, in the main part where you're declaring the other widgets, you need to actually create a Button widget that has something like "Print Chosen Files" as its text, and has this "print_files" sub as its callback.

I guess you want the button you have labeled as "Files" to do the actual printing job, so something like this should work for you (not tested) -- note that the "-command" attribute of the "Files" button is being given a reference to an anonymous array, whose elements are a reference to the callback function, followed by the arg being passed to that function (the arg is the handle for the listbox where the selection will come from):

...
my $listbox = $files_frame->Scrolled("Listbox",
    -scrollbars => "oe",
    -selectmode => "extended")->pack;
$listbox->insert('end', @files);

$exit_frame->Button(-text => "Files",
    -command => [ \&print_filenames, $listbox ])->pack;
$exit_frame->Button(-text => "Exit",
    -command => sub { exit; })->pack;

...


sub print_filenames
{
# callback for the "File" Button
    my $listbox = shift;
    my @selected_files = $listbox->curselection;
    for (@selected_files) {
        my $file = $listbox->get($_);
        print "$file\n";
    }
}
[download]

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