Setting TextRange in ASTNode gives wrong length?

    public partial class TestNode : ActiproSoftware.SyntaxEditor.AstNodeBase    {

        public TestNode(ActiproSoftware.SyntaxEditor.TextRange range) : base(range) { }
        public TestNode() : base() { }

        public static void DoTest1() {
            TestNode node = new TestNode();
            node.TextRange = new ActiproSoftware.SyntaxEditor.TextRange(1, 5);
            Debug.Write(node.Length);
                        
        }
        public static void DoTest2() {
            TestNode node = new TestNode(new ActiproSoftware.SyntaxEditor.TextRange(1, 5));
            Debug.Write(node.Length);
        }

        public override int ContextID {
            get {
                throw new NotImplementedException();
            }
            set {
                throw new NotImplementedException();
            }
        }
    }