ActionScript 3.0 :: Application To Draw Rectangle On Stage?

I'm learning ActionScript 3.0 and I made a small app to draw rectangles on stage. Now I want to drag&drop them around. I want to be able to click on an object, without triggering the stage.addEventListener(MouseEvent.MOUSE_DOWN, clickEvent); but when I click on an object, it also triggers that event. How can I save the click on object from triggering that event on stage?

Here's the code:
Main.as
package {
import flash.display.Sprite;
import flash.events.*;
public class main extends Sprite {
var startX, startY, endX, endY: Number;
function main() {
[Code] .....