public void Insert()
        {
            #region ...

            SPDisplayObject child1 = new SPQuad(32.0f, 32.0f);
            SPDisplayObject child2 = new SPQuad(32.0f, 32.0f);
            SPDisplayObject child3 = new SPQuad(32.0f, 32.0f);

            SPDisplayObjectContainer container = new SPStage();
            container.Add(child1);
            container.Add(child3);
            container.Insert(1, child2);

            Assert.True(container.Count == 3);

            Assert.True(container.IndexOf(child1) == 0);
            Assert.True(container.IndexOf(child2) == 1);
            Assert.True(container.IndexOf(child3) == 2);

            #endregion
        }