Hi Jacob,

Check below code may solve your problem

<?xml version="1.0" encoding="utf-8"?>
<mx:WindowedApplication xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute"
		creationComplete="onCreationComplete(event)" height="800" width="800" >
	
	 <mx:Script> 
        <![CDATA[ 
            import mx.events.FlexEvent; 
            
            private var bgLoader : Loader; 
            private var bgBitmapData : BitmapData; 
            private var bgImagePath:String = "Tulips.jpg"; // set your require background image path 
            
            private function onCreationComplete(event:FlexEvent):void 
            { 
                bgLoader = new Loader (); 
                bgLoader.contentLoaderInfo.addEventListener (Event.COMPLETE, bgLoadingComplete, false, 0, true); 
                bgLoader.load (new URLRequest (bgImagePath)); 
            } 
            private function bgLoadingComplete (event:Event):void 
            { 
                bgBitmapData = new BitmapData (bgLoader.width, bgLoader.height); 
                bgBitmapData.draw ( bgLoader ); 

                bgCanvas.graphics.beginBitmapFill (bgBitmapData); 
                bgCanvas.graphics.drawRect (0, 0, stage.stageWidth, stage.stageHeight); 
                bgCanvas.graphics.endFill (); 
            } 
        
        ]]> 
    </mx:Script> 
	
	<mx:Canvas id="bgCanvas" height="100%" width="100%" />
	
</mx:WindowedApplication>

let me know if you face any problem in this code.. Regards, Virat Patel

Hii,
First of all solution for window and web app is same , and yes you can a background image without using image control in flex.

<mx:WindowedApplication xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute"
backgroundImage="assets/myimage.jpg"
height="800" width="800" >

// your code


</mx:WindowedApplication>


backgroundImage="assets/myimage.jpg" will set as a background Image.