Borja, in these cases, it generally helps get responses if you can attach the app or a sample app with the issue, so folks can look at things in much greater detail.
Regards, Brett
To help users find verified answers, please do not forget to use the "Accept as Solution" button on any post(s) that helped you resolve your problem or question. I now work a compressed schedule, Tuesday, Wednesday and Thursday, so those will be the days I will reply to any follow-up posts.