A: 

Okay actually at this point JQuery helped me to find a quick solution.

This what I did :

 <script type="text/javascript">

    $(document).ready(function() {
        $(".TreeView tbody tr td:nth-child(1)").hide();
    });
</script>

This is the easiest way to solve the problem to me. Thanks JQuery's powerful selectors.

Braveyard
A: 

And actually the other way to solve this problem is that :

.TreeView table tbody tr td:first-child { display:none; }

Braveyard