public static void TestVisibility()
{
Roga2dNode node1 = new Roga2dNode();
Roga2dNode node2 = new Roga2dNode();
node1.Hide();
Tester.Match(node1.IsVisible, false);
node1.AddChild(node2);
Tester.Match(node2.IsVisible, false);
node1.Hide();
Tester.Match(node1.IsVisible, false);
Tester.Match(node2.IsVisible, false);
node1.Show();
Tester.Match(node1.IsVisible, true);
Tester.Match(node2.IsVisible, true);
node1.Destroy();
node2.Destroy();
}