General :: ZXing Library - Intents Not Working

I am developing an app that needs to call "Barcode Scanner" using an Intent. Part of the ZXing library is the IntentIntegrator [URL] ......

The IntentIntegrator allows me to use addExtra to the intent. My plan was to read whatever "extra" I added to the intent in the onActivityResult call after the barcode has been read. The problem is that the Barcode scanner application doesn`t return the extras to me after it reads the barcode.

This is my call to invoke the intent:

Code:
(...)if (v.equals(btBarcode)) {
IntentIntegrator integrator = new IntentIntegrator(this);
integrator.setTitle(getString(R.string.app_name));
integrator.addExtra(Utils.EXTRA_MODO, "add");
integrator.initiateScan();

[Code] ....

Is this the way it is supposed to work (and thus I'll have to find a way to know what button of my app is calling the intent) or is it really a bug in the ZXIng library?