public void Have_OkButton()
        {
            var control = new OkNavigation();

            control.Ok.Should().BeAssignableTo<Button>();
            control.Ok.Content.Should().Be("OK");
        }
        public void Be_Creatable()
        {
            var control = new OkNavigation();

            control.Should().BeAssignableTo<IHaveNavigation>();
        }