Thanks again! I'll have a look at atypes.h immediately.

You mentioned the flags = 0 command, I picked that from the tutorial, unaware of possible errors caused by deleting internal flags. Maybe a warning in the help-files would prevent other Lite-C beginners like me to do use the same lines of code?

Anyway, I changed it to Testpanel.flags =! VISIBLE, I hope that will do it.