public void OnDetached_WhenCalled_UnSubscribesFromMouseLeftButtonUpEvents()
        {
            //Arrange
            var classUnderTest = new ClickableListboxBehavior();
            var mock = Mock.Create<ListBox>(Behavior.CallOriginal);
            classUnderTest.Attach(mock);

            Mock.ArrangeSet(() => mock.MouseLeftButtonUp += null).IgnoreArguments().OccursNever();

            //Act

            classUnderTest.Detach();

            //Assert
            Mock.AssertAll(mock);
        }