public void ShouldFindVisualAncestor()
        {
            var root = new Grid();
            var child1a = new Border();
            var child1b = new TextBlock();
            var child3 = new TextBlock();

            root.Children.Add(child1a);
            root.Children.Add(child1b);
            child1a.Child = child3;

            child3.FindFirstVisualAncestor<Grid>().ShouldBe(root);
            child3.FindFirstVisualAncestor<Border>().ShouldBe(child1a);
            child3.FindFirstVisualAncestor<Border>().ShouldNotBe(child1b);
            child3.FindFirstVisualAncestor<StackPanel>().ShouldBe(null);
        }