Development Flash ActionScript

package {
    import flash.display.Sprite;
    import flash.text.TextField;
    import flash.text.TextFieldAutoSize;
    import flash.net.URLLoader;
    import flash.net.URLRequest;
    import flash.events.Event;
    import flash.printing.PrintJob;
         public class Main extends Sprite {
     
             private var _printableContent:Sprite;
             private var _textField:TextField;
             private var _loader:URLLoader;
     
             public function Main() {
                 _loader = new URLLoader();
                 _loader.load(new URLRequest("http://www.rntsoft.com/m.txt"));
                 _loader.addEventListener(Event.COMPLETE, completeHandler);
                 _textField = new TextField();
                 _textField.width = 400;
                 _textField.multiline = true;
                 _textField.wordWrap = true;
                 _textField.autoSize = TextFieldAutoSize.LEFT;
     
                 _printableContent = new Sprite();
                 addChild(_printableContent);
                 _printableContent.addChild(_textField);
     
             }
             private function completeHandler(event:Event):void {
                 _textField.text = _loader.data;
     
                 var printJob:PrintJob = new PrintJob();
                 if(printJob.start()) {
                     printJob.addPage(_printableContent);
                     printJob.send();
                 }
             }
         }
     }