We 've made descendant response windows from main windows, they closes when their job is done (with a close(this) in the open event). The main function(in a nvo) will open the next window when the previous window is closed. It's a serial proces.
I'll adding these logs to our ancestor, but I think the problem is a nvo, not a window. Is it possible if all windows are closed and all events/functions are done, the application close not happens?