Hello esteemed monks,

I have an weird problem with a Perl-Tk app that uses Tk::JComboBox v1.14 widgets. First time when I try changing state from 'disabled' to 'normal' to a JComboBox widget it throws an error like this:

Tk::Error: Can't set -state to `normal' for
Tk::JComboBox=HASH(0x84da458): Cannot use undef value for object of
type 'color' at /usr/lib/perl5/site_perl/5.10.0/Tk/JComboBox.pm line
1061.
...
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But it does set state to normal, and after that, it's working fine and doesn't throw any errors when alternatively clicking on buttons.

I suspect it might be a installation specific error, but it appears on two on my Linux boxes with Perl 5.10.0 on Slackware 12.2 respectively 13.0 (but not on WindowsXP, with same Perl version).

Here is a similar, in behaviour, code using a single widget:

#!/usr/bin/perl

use strict;
use warnings;

use Tk;
use Tk::JComboBox;

my $mw = MainWindow->new;

my $jcb = $mw->JComboBox(
    # -state      => 'disabled',
    -entrywidth => 15,
    -choices => [
        {-name => 'one', -value => 1},
        {-name => 'two', -value => 2},
        "three",
    ],
)->pack;

my $chstate_n = $mw->Button(
    -text => 'normal',
    -command => sub {
        ch_state_normal();
    },
)->pack;

my $chstate_d = $mw->Button(
    -text => 'disable',
    -command => sub {
        ch_state_disabled();
    },
)->pack;

MainLoop;

sub ch_state_normal {
    print " normal\n";
    $jcb->configure(
        -state => 'normal',
    );
}

sub ch_state_disabled {
    print " disabled\n";
    $jcb->configure(
        -state => 'disabled',
    );
}
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Does anybody else see the same behaviour? Thank you!