UIAutomation FlaUI - Detect Both Closing and Opening Windows at the Application Level

Question

I have successfully used the solution for detecting opening windows described here: UIAutomation FlaUI - Detect opening windows on application level.

However, I would also like to also detect closing window events in addition to opening window events.
I duplicated the code in order to detect the second event:

        AutomationElement root = automation.GetDesktop();

        UIA3AutomationEventHandler automationOpenEventHandler = new UIA3AutomationEventHandler(
            root.FrameworkAutomationElement,
            automation.EventLibrary.Window.WindowOpenedEvent,
            HandleOpenEvents);

        automation.NativeAutomation.AddAutomationEventHandler(
            automation.EventLibrary.Window.WindowOpenedEvent.Id,
            root.ToNative(),
            (Interop.UIAutomationClient.TreeScope)TreeScope.Descendants,
            null,
            automationOpenEventHandler);

        UIA3AutomationEventHandler automationCloseEventHandler = new UIA3AutomationEventHandler(
            root.FrameworkAutomationElement,
            automation.EventLibrary.Window.WindowClosedEvent,
            HandleCloseEvents);

        automation.NativeAutomation.AddAutomationEventHandler(
            automation.EventLibrary.Window.WindowClosedEvent.Id,
            root.ToNative(),
            (Interop.UIAutomationClient.TreeScope)TreeScope.Descendants,
            null,
            automationCloseEventHandler);

However, only one of the two (I believe the second one declared above) actually works. Note that if I declare just one of the handlers above, either the open or close, it works fine. I just don't know how to get both going.

Any help would be appreciated!