Deactivate() public méthode

Deactive is not valid in this Region. This method will always throw InvalidOperationException.
Every time this method is called.
public Deactivate ( object view ) : void
view object The view to deactivate.
Résultat void
        public void DeactivateThrows()
        {
            IRegion region = new AllActiveRegion();
            var view = new object();
            region.Add(view);

            region.Deactivate(view);
        }
        public async Task DeactivateThrows()
        {
            await ExecuteOnUIThread(() =>
                {
                    IRegion region = new AllActiveRegion();
                    var view = new object();
                    region.Add(view);

                    Assert.ThrowsException<InvalidOperationException>(() => region.Deactivate(view));
                });
        }