prevent data grid selection

[crosemffet]

hello everybody and thanks in advance for your support.
I have the following data grid:
    <table class="easyui-datagrid" id="dg-history" name="dg-history" title="xx" data-options="pagination:false,singleSelect:true,url:'ajaxCommander.php?action=getCardLog'">
        <thead>
            <tr>
                <th data-options="field:'cards_log_ta',width:150" align="center"><?php echo $textows[97];?></th>
                <th data-options="field:'cards_state_text',width:130" align="center"><?php echo $textows[73];?></th>
                <th data-options="field:'operators_uname',width:150" align="left"><?php echo $textows[71];?></th>
            </tr>
        </thead>
    </table>

the question is: how can I prevent the yellow row selection when user clicks in the row or cell? I mean, I want when click inside the datagrid do nothing....
thanks again,

[qianet]

Events:
onBeforeSelect(index,row)

Fires before the user selects a row, return false to cancel this action. Available since version 1.4.1.