esri dockable window closing event

Discussion created by jaimebastidas0 on Dec 7, 2017

I'm using arcobjects for .net to build an Adding. I need to be notify when a Dockable window is closed(when the close buttong is clicked and hide the window), so I can do some validations. So far i have tried with Dispatcher.ShutdownStarted and Usercontrol IsVisibleChanged. Any ideas?