Align rigth in column of Datagrid

programming flash
1

package com.pluspixel.controls.listClasses

{

import fl.controls.listClasses.CellRenderer;
private var tf : TextFormat;

public class RigthCell extends CellRenderer
{
    super();

    tf = new TextFormat();
    tf.font = "Verdana";
    tf.color = 0x999999;
    tf.align = "rigth";
    tf.size = 11;
}
override protected function drawLayout():void
{
// What I must to put here
super.drawLayout();
}

}

Thank you