[Oli Short]

Исправил

package vkomande.files
{
	import flash.display.*;
	import flash.events.*;
   	import flash.net.*;
 
	public class vkomandeClass
    {
 
		public var getUrl:String;
        public var resultData:String;
		public static const resultXML:String = 'vasys';
 
 
        public function vkomandeClass()
        {
 
        }
 
        public function getXML()
        {
		var xmlLoader:URLLoader = new URLLoader(new URLRequest("http://vkomande/md5.php?"+getUrl));
        xmlLoader.addEventListener(Event.COMPLETE, viewXML);
        }
 
		public function viewXML(e:Event):void
		{
		var returnData = e.target.data;
		resultData = returnData;
 
        dispatchEvent(new Event(resultXML));
		}
 
    }
}

import vkomande.files.vkomandeClass
 
 
var vkm:vkomandeClass = new vkomandeClass();
vkm.getUrl = 'a=1&b=2&c=3';
 
vkm.addEventListener(vkomandeClass.resultXML, viewResult);
 
function viewResult(e:Event){
trace(vkm.resultData);
}

ругается на

Call to a possibly undefined method dispatchEvent.

dispatchEvent(new Event(resultXML));