# AS3.0 Class from class initiation

**URL:** <https://forum.kirupa.com/t/as3-0-class-from-class-initiation/313555>\
**Category:** flash\
**Created:** [September 2, 2010, 2:40pm UTC](https://forum.kirupa.com/t/as3-0-class-from-class-initiation/313555 "2010-09-02T14:40:06Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![zeeto](https://avatars.discourse-cdn.com/v4/letter/z/e274bd/32.png) [@zeeto](https://forum.kirupa.com/u/zeeto)\
**Post date:** [September 2, 2010, 2:40pm UTC](https://forum.kirupa.com/t/as3-0-class-from-class-initiation/313555/1 "2010-09-02T14:40:06Z")

</div>

Hi Guys,

Trying to start with AS3.0 classes and I’m having problems to understand the basics.

I’ve got 3 files:

**main.fla**

```auto
empty

```

**main.as**

```auto
package  
 {
 import flash.display.MovieClip;
 import engine.StageSetup;
 
 public class Main extends MovieClip 
 {
  public function Main():void 
  {
   trace("Main loaded");
  }
 }
}

```

**StageSetup.as**

```auto
package engine 
{
    import flash.display.Sprite;
    import flash.display.StageAlign;
    import flash.display.StageScaleMode;
    import flash.events.Event;
    public class StageSetup extends Sprite 
 {
        public function StageSetup() 
  {
            stage.scaleMode = StageScaleMode.NO_SCALE;
            stage.align = StageAlign.TOP_LEFT;
            stage.addEventListener(Event.ACTIVATE, activateHandler);
            stage.addEventListener(Event.RESIZE, resizeHandler);
   trace("StageSetup loaded");
        }
        private function activateHandler(event:Event):void 
  {
            trace("activateHandler: " + event);
        }
        private function resizeHandler(event:Event):void 
  {
            trace("resizeHandler: " + event);
            trace("stageWidth: " + stage.stageWidth + " stageHeight: " + stage.stageHeight);
        }
    }
}

```

I have imported StageSetup in my **Main.as** however I’m not sure what else needs to be done to get the **StageSetup** to work.

Thanks