Hi, nice example. Maybe this is a stupid observation, but the original code works if I put the -options into the dialog add statement. Maybe there is a good reason why you put them into a separate configure? I'm guessing that the problem comes from the -textvariable reference not detecting the change to \$id. 
  my $id = $sel || (@ids && $ids[0]) || '';
  
  my $IDText = $dlg->add (
        'JComboBox',
        -options => \@ids,
        -mode => 'readonly',
        -selectcommand => [\&changeEditPlayer, \$id],
        -validate => 'match',
        -textvariable => \$id,
        );
    
#    $IDText->configure (-options => \@ids);
    $IDText->setSelected ($id);
    return if $dlg->Show (-global) ne 'OK';
}

[download]

Another way I sometimes use, is to set the -textvariable directly to the first array element. This works, but I really havn't tested it, for glitches. :-) 

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

my $main = MainWindow->new (-title => "Test JComboBox");
EditPlayers ($main);

sub EditPlayers {
    my ($main, $sel) = @_;
    my @ids = qw(Fred Joe Bob);
    my $dlg = $main->DialogBox (-title => "Member Information", -butto
+ns => ["OK", "Cancel"]);

    my $IDText = $dlg->add (
        'JComboBox',
    -options => \@ids,
        -mode => 'readonly',
        -selectcommand => [\&changeEditPlayer, \$ids[0]],
        -validate => 'match',
        -textvariable => \$ids[0],
        );
    
    $IDText->form (-left => '%0', -right => '%100', -top => '%0');

#    $IDText->setSelected ($ids[1]);  #works

    return if $dlg->Show (-global) ne 'OK';
}


sub changeEditPlayer {
    my ($id, $widget, $index, $value, $name) = @_;

    return 1 if ! defined $name;
    print "$name\n";
}

[download]
I'm not really a human, but I play one on earth. flash japh

In reply to Re: How do I set the default item in a Tk::JComboBox by zentara
in thread How do I set the default item in a Tk::JComboBox by GrandFather

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.