Irrlicht Engine

I am creating a Windows Form application and I'm using Irrlicht version 1.7.2, in an area. I have a PropertyGrid in which I need to display certain properties, also I have other GUI components such as TextBox, etc. When the cycle begins drawing the scene and I want to write something in the PropertyGrid or any of the other components, the keys of the keyboard letters or numbers can not be used, but the up, down, left, right , shift, ctrl, delete, home, end, keys, works. In the Irrlicht version 1.6 this did not happen. I know that in the 1.7, updated the win32 key handling. Does anyone know how to solve this and have any idea that can help me?
Thank you very much.

Irrlicht events uses a system like a chain of responsibilities. If some keys are not correctly cathced that's because they were cathced from some other listener you must search who is catching the events you want to use. If you want to use Forms you must know how irrlicht event system works.