ActionScript 3.0 :: 1061: Call To A Possibly Undefined Method AddEventListener Through A Reference With Static Type XMLLoadData

I try to make working an XML loader from a custom class on a new var, but when I add an Event listener it tells me this:

1061: Call to a possibly undefined method addEventListener through a reference with static type XMLLoadData.

This is the code I have on the stage:

Code:
var xmlLoad: XMLLoadData = new XMLLoadData("navigation.xml"); //load the xml file
xmlLoad.addEventListener(Event.COMPLETE, onComplete); // execute onComplete once the xmlLoad is fully loaded
function onComplete(e:Event):void{
//
}

and this is the code of my custom class XMLLoadData
Code:

package{
import flash.net.*;
import flash.events.*;

[code]....

If I remove the listener on line 2 from stage, it working, but all my code execute the wrong way because the XML is not fully loaded.