public void Remove(Widget child) { throw new NotImplementedException(); }
		public double IndexOf(Widget child) { throw new NotImplementedException(); }
		public void AddAt(Widget child, double index, object options = null) { throw new NotImplementedException(); }
		public void AddBefore(Widget child, Widget before, object layoutProperties = null) { throw new NotImplementedException(); }
		public void AddAfter(Widget child, Widget after, object layoutProperties = null) { throw new NotImplementedException(); }