Window Close Events Not Fireing

PB 12.5.1

I have an MDI application that I recently added the tracing functionality.  This window is opened with the simple command: Open(w_tracing).  Now, when I close the application all my sheets receive the CloseQuery and Close events except this one and yet the window does close.  I need to run some cleanup if the user did not stop the tracing.

This seems so elementary to me but why would these events not get triggered when the app closes?

Thanks,

Chris Craft