App Designer - How to create a callback function for pressing the 'Close Window' Button

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Hello,
I would like to give the user a warning when certain actions have not been done, such as selecting a number of options from dropdown lists, and the user attempts to close the window by pressing on the 'x' shown below.
How can I create a callback function for this button?
Thanks,
Carlos

Accepted Answer

Mario Malic
Mario Malic on 17 Feb 2021
Hi Carlos,
here's the answer from Adam Danz.

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R2020b

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