Who should remove popup, calling app or popup itself?

Best is always subjective, but I usually handle closing of the window in the window component; and then dispatch an event with appropriate data (In this case Record No) back to the application. It sounds like your 90% there. Just instead of dispatching an event Event, create a custom Event class with your recordID.

Then it won't matter if the pop up is still in memory or not when you need to use the record ID.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.