https://learn.microsoft.com/en-us/dotnet/api/system.windows.weakeventmanager.protectedremovelistener?view=netframework-4.8.1&viewFallbackFrom=windowsdesktop-10.0
WeakEventManager.ProtectedRemoveListener(Object, IWeakEventListener) Method (System.Windows) |...
Removes a previously added listener from the provided source.
objectmethodsystemwindows