Thank you very much for your reply, the problem has been resolved. This is what happened, I first downloaded the trial version of the software and started inmediately using it. I created some controls and implemented some other stuff in my code. Since it worked so nicely I bought the software and continue using the code I had created with the trial version. It didn't at that moment seem to matter. However, it did started to conflict with the permanent license when I created my first winButtons inside the winGroupBox, othewise the buttons worked just fine. I re-created all the controls using the purchased version and everything started to work just fine. 

Thank you very much for your answer.

Natalia