UPDATE: found problems with the previous code when having multiple BrowseEntry objects. This however works.

#!/usr/bin/perl
use Tk;
use Tk::BrowseEntry;
use strict;

my $mw = MainWindow->new();

my $hddSel = $mw->BrowseEntry()->pack;

foreach my $c (1..50) {
  $hddSel->insert("end",$c);
}

$hddSel->Subwidget("slistbox")->selectionSet(0);
$hddSel->LbCopySelection($hddSel); #use the widgets internal method to
+ copy the selected value to the entry
print "CURRENT VALUE: ".$hddSel->Subwidget("slistbox")->get((@{$hddSel
+->Subwidget("slistbox")->curselection})[0])."\n";


MainLoop;

sub getValue {
    my ($getW) = @_;
    return $getW->cget( '-textvariable' );
}

sub setValue {
    my ($setW, $index) = @_;
    my $lb = $setW->Subwidget('slistbox')->Subwidget('listbox');
    my $var_ref = $setW->cget('-textvariable');
    $lb->selection('clear', 0, 'end');
    $lb->selectionSet($index);
    $$var_ref = $lb->get($index);
    return;
}
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