Disable or modify close button (red X) at top right of window?

[Gan Uesli Starling]

I've had a request to disable or modify the RED X at top right of MS Window for a LabVIEW program.

Everyone here knows to ONLY use File->Exit to quit from LabVIEW. Sometimes, though a harried operator on a PC with plural windows will accidentally click that RED X thinking it's the overlaying ap's window. This, of course, wreaks havoc on the test underway. Would be nice to make that impossible, or at least doubly hard.

So...is there a way to do that? Or alternately, to cause an ARE YOU SURE? intermediary window?

TIA,

Gan

[asbo]

Check out the Panel Close? and Application Instance Close? events. The question mark in the event name indicates it's a filter event, where you wire out a boolean which indicates whether to honor the action or not.

[crossrulz]

There is also the option in VI Properties->Window Appearance to disable "Allow use to close window". My personal preference is to use the Panel Close? event as asbo has already mentioned.

[Aristos Queue]

I prefer to just disable the X using the VI Properties... less code on diagram to have to worry about. And the user doesn't have a useless [X] button to keep clicking on that doesn't do anything. Unless, of course, you're going to actually add code so that the [X] button causes Exit.

[asbo]

Aye, typically I wouldn't disable it altogether. It might be conditionally disabled during a specific action or present a prompt tied to a proper shutdown procedure instead.

[Gan Uesli Starling]

Thank you everyone. I tried both ways and decided to go with the Panel Close Event structure.