[flexcoders] How do I add a Progress bar to show the render to JPG progress?

[sailorsea21]

Hi everyone, I have a button which renders my component to JPG.
How can I attach a progress bar to show the progress of the rendering?

<mx:Button label="render" click="renderasJPEG()"/>

public function renderasJPEG():void
{                       
    convertToImage(component001, new JPEGEncoder(100));
}
                        
private function convertToImage(object:IUIComponent, 
encoder:IImageEncoder):void
{
    var base64string:String = ImageSnapshot.encodeImageAsBase64(
    ImageSnapshot.captureImage(object, 72, encoder));
    var variables:URLVariables = new URLVariables();
    variables.encoded = base64string;
    variables.type = "jpeg";
    var request:URLRequest = new URLRequest("script_saveasimage.php");
    request.method = "POST";
    request.data = variables;
    navigateToURL(request, "_blank");
}

Thanks.