public void Remove()
        {
            FormGroup g = new FormGroup("");

            FormLabel l = new FormLabel("");

            g.Add(l);
            g.Remove(l);

            Assert.IsNull(l.Container);
            Assert.IsFalse(g.Contents.Any(c => ReferenceEquals(c, l)));
            Assert.AreEqual(g.Contents.Count, 0);
        }
        public void RemoveNull()
        {
            FormGroup g = new FormGroup("");

            g.Remove(null);
        }