[flexcoders] Using custom checkBox in datagrid

[candysmate]

I'm using a custom itemRenderer (centered checkBox), based upon Alex
Harui's  excellent blog in a dataGrid.

My dataGridColumn has:

<mx:DataGridColumn
                                                                        
headerText=""
                                                                        
dataField="select"
                                                                        
width="30"
                                                                        
itemRenderer="com.toro.classes.CenteredCheckBox">
                                                                 
</mx:DataGridColumn>           

the class is:

package com.toro.classes
{
import flash.display.DisplayObject;
import flash.text.TextField;
import mx.controls.CheckBox;

public class CenteredCheckBox extends CheckBox
{

        public function CenteredCheckBox()
        {
                super();
        }

        /**
         *  center the contentHolder
         */
        override protected function updateDisplayList(w:Number, h:Number):void
        {
                super.updateDisplayList(w, h);

                var n:int = numChildren;
                for (var i:int = 0; i < n; i++)
                {
                        var c:DisplayObject = getChildAt(i);
                        if (!(c is TextField))
                        {
                                c.x = (w - c.width) / 2;
                                c.y = 0;
                        }
                }
        }

}

}

How can I get the boolean value held in array portion 'select' for the
dataProvider 'coloursArray' toggle when the checkbox is
selected/unselected please?