I would probably go the route of manipulating the -choices array.
#!/usr/bin/perl -w
use strict;
use Tk;
use Tk::BrowseEntry;
my $mw = MainWindow->new();
my $sel = '';
my @choices = qw(1 2 3 4 5 6 7);
my $mb; #declare it first so can call it in callback
$mb = $mw->BrowseEntry(
-label => 'List One',
-choices => \@choices,
-variable => \$sel,
-browsecmd=>sub{
#print "@_\n";
my $selected = $_[1];
#print "$selected\n";
@choices = grep { $_ ne $selected } @choices;
$mb->configure(-choices => \@choices);
# print "@choices\n";
}
)->pack();
MainLoop;
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