I have a program that uses a custom toolbar exclusively, I hide all other
toolbars. If the user exits the program using the custom menu or toolbar,
the standard toolbars that were displayed previously are restored.

If the user exits my program using ALT-F4, selects the close 'x' button in
the upper right corner, or clicks on the upper left corner and selects close,
the toolbars are not restored as needed/expected.

How can I capture (preferably) or disable these avenues of exit.