please helpme

[phanimadhav]

package
{
import flash.display.Shape;
import flash.display.Sprite;

import mx.controls.Alert;

public class Greeter extends Sprite
{
private var size:uint=80;
private var bgColor:uint=0xFFCC00;
private var borderColor:uint=0x666666;
private var borderSize:uint=0;
private var cornerRadius:uint=9;
private var gutter:uint=5;
public function DisplayCircle():void
{
var child:Shape=new Shape();
var halfsize:uint=Math.round(size/2);
child.graphics.beginFill(bgColor,1);
child.graphics.lineStyle(borderSize,borderColor);
child.graphics.drawCircle(halfsize,halfsize,halfsi ze);
child.graphics.endFill();
addChild(child);
Alert.show("This is mycircle","Alert",Alert.OK);
}
}
}
this is my code but The circle was not appear.It is successfully complied but i don't know what happen there any one please help me