Wow. Never noticed that. I guess because I always inactivated the drug. 90% of the time, I don't write anything so, while it is a good idea, I wish I could get rid of it.
Maybe make it so it pops up, but you can ignore it, and if you hit enter or something. Be better if, when you click on the inactivate button, it just inactivated, and when you right-clicked you get the window. Or the right-click could give you a) inactivate and b) inactivate and give reason.
But, you are right. There are four ways to close that box, and all four of them do not allow you to change your mind.