How can I clear the sorted Column in ListBox?

[Emile Schwarz <emile dot a dot schwarz at wanadoo dot fr>]

Hi,

I load a text file, 'process data' and send the result in a ListBox. Then I sort 
Column(1) of the ListBox.
In the next 'process data', I still have the selected Column. I want to deselect 
it when I click in the 'Process data' button.

I've made some searching (both in the Language Reference and User’s Guide pdf) 
but without success so I’m coming here.
How can I do that ?

TIA,

Emile

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