Hi,

It is supposed to do that, delete the contents of the ROText widget, before inserting a new value. It's not what you want?

I have one more list box

Maybe because, you use pack and place in the same time?

After a little cleanup:

use strict;
use warnings;

use Tk;
use Tk::LabFrame;
use Tk::ROText;

my $mw = MainWindow->new();
$mw->geometry("500x400");

my $f1 = $mw->LabFrame(
    -label     => "List-box-selection",
    -font      => 'ukai',
    -labelside => "acrosstop",
)->pack();

my @list = (qw/test1 test2 test3 test4 test5/);

my $lb = $f1->Scrolled(
    "Listbox",
    -scrollbars  => "e",
    -selectmode  => "extended",
    -font        => 'ukai',
    -activestyle => "dotbox",
)->pack();

$lb->insert( 'end', @list );

my $txt_scroll;
$lb->bind(
    '<Double-1>' => sub {
        my $current_ip = $_[0]->get( $_[0]->curselection );
        $txt_scroll->delete( '1.0', 'end' );
        $txt_scroll->insert( 'end', "SELECTED IP : $current_ip\n" );
    },
);

my $f2 = $mw->LabFrame(
    -label     => "Commands Info",
    -font      => 'ukai',
    -labelside => "acrosstop",
)->pack();

$txt_scroll = $f2->Scrolled(
    'ROText',
    -scrollbars => 'osoe',
    -height     => 6,
    -width      => 25,
    -font       => 'ukai',
)->pack();
$mw->update();

MainLoop;
[download]

Regards, Stefan