To be exact this is the error.

```
TypeError: Error #1009: Cannot access a property or method of a null object reference.
    at fl.containers::BaseScrollPane/drawBackground()
    at fl.controls::TileList/draw()
    at fl.core::UIComponent/callLaterDispatcher()

```

Now I've tried several of Adobe's own examples from this page, <http://livedocs.adobe.com/flash/9.0/ActionScriptLangRefV3/fl/controls/TileList.html>, and they all throw this error as well.

The error is triggered by the TileList instance being the argument of the addChild function.

Here's my package, which works fine when I change the displayComponent is be a List.

```
package com.pennstate {
    import fl.data.DataProvider;
    import flash.display.MovieClip;
    import flash.display.DisplayObjectContainer;
    import flash.events.Event;
    import flash.net.URLLoader;
    import flash.net.URLRequest;
    import flash.text.TextFormat;
    import flash.xml.XMLDocument;
    import com.adobe.serialization.json.JSON;
    import fl.controls.List;
    import fl.controls.TileList; 

    public class Sign {
        public var displayComponent:TileList;
        public var url:String;
        public var provider:DataProvider;
        public var mc:MovieClip;
        public var container:DisplayObjectContainer;

        public function Sign( url:String, container ) {
            this.container = container;
            this.displayComponent = new TileList();
            this.mc = new MovieClip();
            this.url = url;
            this.provider = new DataProvider();

            _componentSetup();
            loadJson();
            _componentFormat();
        }

        private function _componentSetup() {
            displayComponent.labelFunction = getLabelFieldContent;
            displayComponent.sourceFunction = getSourceFieldContent;
            displayComponent.dataProvider = provider;
            displayComponent.selectable = false;
            displayComponent.setStyle("contentPadding", 5);
            displayComponent.setSize(1720,770);
            displayComponent.move(100,200);
            displayComponent.rowHeight = 190;
            trace('End setup');
        }

        private function _componentFormat() {
            var listTextFormat:TextFormat = new TextFormat();
            listTextFormat.font = "Arial";
            listTextFormat.color = 0x000000;
            listTextFormat.bold = true;
            listTextFormat.size = 48;
            displayComponent.setRendererStyle("textFormat", listTextFormat);
            trace('End formatting');
        }

        function loadJson():void {
            var jsonLoader:URLLoader = new URLLoader();
            jsonLoader.addEventListener(Event.COMPLETE, onJsonComplete);
            jsonLoader.load( new URLRequest( url ) );
        }  

        function onJsonComplete(e:Event):void {
            trace('Loading finished.');
            var jsonData:String = e.target.data;
            trace(jsonData + "\n");
            var decodedData = JSON.decode(jsonData, false);
            for (var index in decodedData.rows) {
                provider.addItem({title: decodedData.rows[index].node.title, result: decodedData.rows[index].node.Result});
                trace(index+" => "+decodedData.rows[index].node.title);
                trace(index+" => "+decodedData.rows[index].node.Result);
            }
            container.addChild(displayComponent);
        }

        function getLabelFieldContent(item:Object):String {
            return new XMLDocument(item.title + "\n" + item.result).firstChild.nodeValue;
        }

        function getSourceFieldContent(item:Object):String {
            return item.result;
        }

    }
}

```