🚀 go-pugleaf

I have Googled this to death, and have seen quite a bit about similar
problems, but not exactly like my situation.

I have an application (normal app, not system tray like many I saw) that
uses the OnCloseQuery handler to do some cleanup before the app terminates.
Works great when the user closes the application.

However, when Windows does a shutdown things are different.   My
OnCloseQuery handler is being executed.   It is setting CanClose to true.
But, Windows is not closing my app and aborts the shutdown process.   This
leaves my app running, but since I did my cleanup, in an unstable state.

Why would Windows not shut down my app if I told it that it CanClose?

I am not using AllocateHWND as was suggested in many previous posts.    I do
have a custom component that overrides the WndProc(), but it passes
processing of all but one message (WM_GETDLGCODE) on to TWinControl's
WndProc().   This is the only WndProc that I have overridden myself.   I
tried having this WndProc() trap the WM_QUERYENDSESSION message and set the
Result to 1, but this did not help.

Any help is greatly appreciated.

Joe