Show progress bar and percents when packaging a native installer with adt packager

Hello,

Below is a simple example using the AIR's NativeProcess for compiling an air application into a native installer... Everything works fine, so at the end of the NativeProcess, the native installer (*.exe) is created... In this case, the application which I'm trying to compile is small (approx. 600KB)... However, if I have to package into native installer a bigger file (several MBs), I would like also to monitor the progress by using a progress bar and percents... How?

private var file:File
private var nativeProcessStartupInfo:NativeProcessStartupInfo;
private var nativeProcess:NativeProcess;

private function compile():void{
  file = new File("C:\\Program Files\\Java\\jre7\\bin\\java.exe");
  nativeProcessStartupInfo = new NativeProcessStartupInfo();
  var args:Vector.<String> = new Vector.<String>();
  args.push("-jar");
  args.push(adtPath);
  args.push("-package");
  args.push("-storetype");
  args.push("pkcs12");
  args.push("-keystore");
  args.push(certPath);
  args.push("-storepass");
  args.push("mypass");
  args.push("-target");
  args.push("native");
  args.push(exePath);
  args.push(xmlPath);
  args.push("-C");
  args.push(swfPath);
  args.push("testApp.swf");
  args.push("icons");
  nativeProcessStartupInfo.arguments = args;
  nativeProcessStartupInfo.executable = file;
  nativeProcess = new NativeProcess();
  nativeProcess.addEventListener(ProgressEvent.STANDARD_OUTPUT_DATA, onOutputData);
  nativeProcess.addEventListener(ProgressEvent.STANDARD_ERROR_DATA, onErrorData);
  nativeProcess.start(nativeProcessStartupInfo);
}
private function onOutputData(event:ProgressEvent):void{
   var op:String =  nativeProcess.standardOutput.readUTFBytes(nativeProcess.standardOutput.bytesAvailable);
   trace("output = " + op);
}
private function onErrorData(event:ProgressEvent):void{
   var er:String = nativeProcess.standardError.readUTFBytes(nativeProcess.standardError.bytesAvailable);
   trace("error = " + er);
}

Thanks in advance,

Nikola