>>>I consider it disconcerting to the user to monkey with fundamental Windows controls. We shouldn't be playing Three Card Monte with them.
>>
>>I guess we totally disagree here.
>
>I'm with Mike on this one. Your form must have an existing way of being closed. Why not handle the OnFormClosing event in the same way? The args will tell you what triggered the closure and you can still cancel it if you want. IMO that's much more in keeping with the normal user experience.....

Agree and it was Bonnie's suggestion in the referenced thread.