Can you please elaborate more. I mean,

1)What the user is exporting in this case.

2)Why do you want to show an alert message on closing? 

3)Is the current scenario OOTB?

1)What the user is exporting in this case.

Export file rpt to excel

2)Why do you want to show an alert message on closing?

I want to extract many files rpt to excel, I'm using listloop. I want to detect when popup close because I need to close current report before go to next one

3)Is the current scenario OOTB?

Sorry, I don't understand OOTB. 

If I using Destroyed event only, it can work, but when I using WaitForEvent, it doesn't work

Apologies. I thought it is PRPC. Please tag robotics for appropriate responses.

Hi There,

Ideally destroyed should have worked. Can you check for a simple HTML with popup to understand if that works at your end first.

Lost Focus may not work because the control under question would get destroyed and hence other methods may not work as well.

 Thanks,

Ujjwal