Its a tkx bug plain and simple

See Tcl::Tk, this works 

#!/usr/bin/perl --
use strict;
use warnings;
Main( @ARGV );
exit( 0 );
sub Main {
    Fudge();
    Fudge();
}
sub Fudge {
    use Tcl::Tk;
    my $int = new Tcl::Tk;
    my $mw = $int->mainwindow;
    my $lab = $mw->Label(-text => "Hello world")->pack;
    my $btn = $mw->Button(-text => "test", -command => sub {
        $lab->configure(-text=>"[". $lab->cget('-text')."]");
    })->pack;
    $int->MainLoop;
}

[download]

Why this works? Because each $int Tcl::Tk is a new Tcl interpreter

Why the same doesn't work with Tkx? Because Tkx creates a single Tcl interpreter, and when it ends, that's it, it ends

You can patch Tkx.pm, its pure-perl, but this is a bug in Tkx

In reply to Re^3: TKX and closing windows (bug) by Anonymous Monk
in thread TKX and closing windows by x-lours

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.