[flexcoders] How do I use the itemrenderer for Datagrid column

[jovialrandor]

I have the following code that turns Datagrid cell to red if the 
value is not 'Y' for 'L0' attribute of the arraycollection object.  
However, when I run the program, it does not take effect.

---------------------------

package {
    import mx.controls.Label;
    import mx.controls.listClasses.*;

    public class BItemRenderer extends Label {

        private const POSITIVE_COLOR:uint = 0x000000; // Black
        private const NEGATIVE_COLOR:uint = 0xFF0000; // Red 

        override protected function updateDisplayList
(unscaledWidth:Number, unscaledHeight:Number):void {
            super.updateDisplayList(unscaledWidth, unscaledHeight);

            /* Set the font color based on the item price. */
            setStyle("color", (data.L0 != 'Y') ? NEGATIVE_COLOR : 
POSITIVE_COLOR);
        }
    }
}