Google map: How to display Markers?

programming flash
1

I’m having an issue to display markers into google map. I use XML to parse those markers.

**Flash gives me that error msg:
TypeError: Error #1009: Cannot access a property or method of a null object reference.

However I can see Latitude and Longitude display while traced them…

Does anyone can help me?


package 
{
    import flash.display.Sprite;
    import flash.events.Event;
    import flash.geom.Point;
    
    import com.google.maps.LatLng;
    import com.google.maps.Map;
    import com.google.maps.MapEvent;
    import com.google.maps.MapType;
    import com.google.maps.overlays.Marker;
    import com.google.maps.overlays.MarkerOptions;
    import com.google.maps.controls.ZoomControl;

    import utils.LoadXML;
    import utils.ParseXML;
    

    public class GoogleMaps extends Sprite 
    {
        private var loader:LoadXML;
        private var parser:ParseXML;
        private var tabMarkers:Array;
        private var map:Map;
        
        private static var FILE:String = "../xml/markers.xml";
        private static var KEY:String = "";
        
        public function GoogleMaps()
        {
            map = new Map();
            map.key = "ABQIAAAAySpiyKFbR2kyvDyp02w_DhT2yXp_ZAY8_ufC3CFXhHIE1NvwkxTnKLUMs9zrkisTjGfTICBrTK1K2w";
            map.setSize(new Point(stage.stageWidth, stage.stageHeight));
            map.addEventListener(MapEvent.MAP_READY, onMapReady);
            
            addChild(map);
            
            loadXML();
        }
        
        
        private function onMapReady(event:Event):void 
        {
              map.setCenter(new LatLng(45.555255,-73.581336), 13, MapType.NORMAL_MAP_TYPE);
              map.addControl(new ZoomControl());
        }
        
        private function loadXML()
        {
            loader = new LoadXML(FILE, handleLoadedXML);
        }
        
        
        private function handleLoadedXML(event:Event)
        {
            var markers:XML = new XML(event.target.data);
            parser = new ParseXML(markers);
            
            tabMarkers = new Array();
            
            for each(var item:XML in markers.point)
                tabMarkers.push({ latitude:item.lat, longitude:item.long });
            
            for(var i:int=0; i<tabMarkers.length; i++)
            {
                trace(tabMarkers*.longitude);
                var latLng:LatLng = new LatLng(tabMarkers*.latitude, tabMarkers*.longitude);
                
                map.addOverlay(new Marker(latLng));
            }            
            
        }
        
    }
}

XML file:


<?xml version="1.0" encoding="UTF-8"?>
<site>
    <point>
        <lat>45.538</lat>
        <long>-74.56</long>
    </point>
    <point>
        <lat>45.265</lat>
        <long>-74.86</long>
    </point>
</site>