onKeyboardKeyDown window focus problem

[Woidl]

Hi,
in Windows builds, the onKeyboardKeyDown/Up only reacts if the Shiva-App window is in foreground (top), in Linux Shiva ALWAYS reacts on key events, even if it's minimized.
Question: Is there some workaround for this problem?
Or do we have to make our own C++ plugin and work with XGetInputFocus?

Best Regards and thnx for any help!