Ja,
I understand perfectly now \:D

you want to do this then:

 Code:

$tree = $system.TreeView ;or, if you use the form as parent: $tree = $form.TreeView

$tree.Nodes.Add('ola')
$tree.Nodes.Add('ola1')
$tree.Nodes.Add('ola2')
$tree.Nodes.Add('ola3')

$tree.SelectedNode = 2


If you don't have it already, I recomend you keep this little helper with you:
http://www.kixforms.org/assets/files/kixforms/KiXforms_246.chm

hth
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