Basic How to Custom Menu Script Trigger

[obe1]

I want to create a custom menu that will trigger a script when a window is closed, by whatever means, keyboard, mouse, and so on.

I've been told the best way to do this is create a custom menu that will run a script when the window is closed. I can't seem to accomplish this. I create a menu with the script I want attached to the File>Close menu selection and set that menu to run with a specific layout.

Instead of running the script the custom menu disables everything, including the ability to close the window by any means. I have to go into tools and reset the menu selection to regain control over the window.

I know this is basic FileMaker, however, I've just never had the need to use a custom menu until now.

All help is greatly appreciated.