Need help to select some listbox item in different listbox together

Hello,

Does anyone know how to do the following:

I have a problem when I want to Select some listbox item in different
listbox in the same time together. I have found a code and make a little
changing to the code. In that code there are 3 listbox with different
item, when I select the first item (first listbox), the selection is
only show in the third item (in the third listbox), whereas I want to
make all of the third item in the same row in that three different
listbox selected together.


Here is mycode :
require 'tkextlib/tile'

$countrycodes = %w{ ar au be br ca cn dk fi fr gr in it jp mx nl no es
se ch }
$countrynames = %w{ Argentina Australia Belgium Brazil Canada China
Denmark
        Finland France Greece India Italy Japan Mexico Netherlands
Norway Spain
        Sweden Switzerland}
$nomor = %w{ 1 2 3 4 5 6 7
        8 9 10 11 12 13 14 15 16 17
        18 19}

$names = TkVariable.new ( $countrynames )
$kode = TkVariable.new ( $countrycodes )
$no = TkVariable.new ( $nomor )


root = TkRoot.new
content = Tk::Tile::Frame.new(root) {padding "5 5 12 0"}.grid :column =>
0, :row => 0, :sticky => "nwes"
TkGrid.columnconfigure root, 0, :weight => 1
TkGrid.rowconfigure root, 0, :weight => 1


$countries = TkListbox.new(content) {listvariable $names; height
5;selectmode 'multiple'}
$kode = TkListbox.new(content) {listvariable $kode; height 5;selectmode
'multiple'}
$no = TkListbox.new(content) {listvariable $no; height 5l;selectmode
'multiple'}

$countries.grid :column => 0, :row => 0, :rowspan => 6, :sticky =>
'nsew'
$kode.grid :column => 1, :row => 0, :rowspan => 6, :sticky => 'nsew'
$no.grid :column => 2, :row => 0, :rowspan => 6, :sticky => 'nsew'
TkGrid.columnconfigure content, 0, :weight => 1
TkGrid.rowconfigure content, 5, :weight => 1

$countries.bind '<ListboxSelect>', proc{pilihAnggota}

def pilihAnggota
    idx = $countries.curselection
      $kode.selection_set idx
  $no.selection_set idx
end





# Colorize alternating lines of the listbox
0.step($countrycodes.length-1, 2) {|i| $countries.itemconfigure i,
:background, "#f0f0ff"}
0.step($countrycodes.length-1, 2) {|i| $kode.itemconfigure i,
:background, "#f0f0ff"}
0.step($countrycodes.length-1, 2) {|i| $no.itemconfigure i, :background,
"#f0f0ff"}

$countries.selection_set 0
#showPopulation

Tk.mainloop

================================================================
Thank's for your help.

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