Print complete document from stagewebview

I have a air application that shows in a stagewebview a facebook app.

In that facebook app you have to fill in a form.

Under the form there is a print button (that won't work)

So I wrote my own print button.

But the problem is that I have to convert the viewport of the stagewebview to a bitmap

and then print the bitmap to pdf or my printer.

But he always just take the part that is shown on my stage.

But I have to print the whole document that is in the stagewebview...

Can anybody help me?

Here is my code to convert to bitmap and the print...

var bitmapData:BitmapData = new BitmapData(iBreedte,iHoogte);
  webView.location;
  webView.drawViewPortToBitmapData(bitmapData);
  var webViewBitmap:Bitmap = new Bitmap(bitmapData);

  var myPrintJob:PrintJob = new PrintJob();
  var options:PrintJobOptions = new PrintJobOptions();
  options.printAsBitmap = true;

  myPrintJob.start();

  var s:Sprite = new Sprite();
  s.height = iHoogte;
  s.width = iBreedte;

  s.addChild(webViewBitmap);
  s.scaleX = .40;
  s.scaleY = .40;
  myPrintJob.addPage(s, null, options);

myPrintJob.send();