[djyamato]

private var FState:String;
 
addEventListener(StateEvent.CHANGE,stateChangeHandler);
 
public function get state():String
{
  return FState;
}
public function doSomething():void
{
  // do something with socket etc...
}
 
protected function stateChangeHandler(event:StateEvent):void
{
   FState=event.messageData.data;
   dispatchEvent(new Event(Event.CHANGE));
}

package 
{
	import flash.events.Event;
	public class StateEvent extends Event
	{
               public var messageData:Object;
               public static const CHANGE:String="stateChange";
 
               public function StateEvent(type:String, data:Object=null)
	    {
                  super(type, data);
	       var messObj:Object=new Object();
	       messObj.data=data;
	       this.messageData=messObj;
               }
         }
}

myClass.addEventListener(Event.CHANGE,myClassStateChangeHandler);
myClass.doSomething();
 
protected function myClassStateChangeHandler(event:Event):void
{
   trace("state changed to "+myClass.state);
}