How To Set the Row Height of a TableLayoutPanel Row

I don't seem to be able to adjust the row height of a single row TableLayoutPanel whose RowStyle is set to SizeType.Absolute with an explicit height value .  See the demo code below.  It doesn't seem to matter what value I put in the 2nd parameter (the height) of the RowStyle.Add method or whether I explicitly set the height via the property in the next statement.

I thought that perhaps the Labels I added to the cells were too big so I explicitly kept them small.  That didn't help either.

Any ideas?  Thanks.  Steve

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace TableLayoutPanel_Demo
    {
    public partial class Form1 : Form
        {
        private string[] labels = { "Label 1", "Label 2", "Label 3" };
        private int[] columnSpan = { 2, 1, 2 };

        public Form1()
            {
            InitializeComponent();

            TableLayoutPanel tlpDemo = new TableLayoutPanel();
            tlpDemo.GrowStyle = TableLayoutPanelGrowStyle.FixedSize;;
            tlpDemo.CellBorderStyle = TableLayoutPanelCellBorderStyle.Single;
            tlpDemo.Width = 300;

            // Add 5 columns
            tlpDemo.ColumnCount = 5;
            for (int i = 0; i < 5; i++)
                tlpDemo.ColumnStyles.Add(new ColumnStyle(SizeType.Absolute, tlpDemo.Width / tlpDemo.ColumnCount));

            // Add 1 row
            tlpDemo.RowCount = 1;
            tlpDemo.RowStyles.Add(new RowStyle(SizeType.Absolute, 20));
            //tlpDemo.RowStyles[0].Height = 10;

            // Add labels to the cells
            int nextCol = 0;
            for (int i = 0; i < labels.Length; i++)
                {
                Label lbl = new Label();
                lbl.Height = 20;
                lbl.Text = labels[i];
                lbl.Text = lbl.Text.TrimEnd();
                lbl.Dock = DockStyle.Fill;
                lbl.Anchor = AnchorStyles.None;
                tlpDemo.Controls.Add(lbl, nextCol, 0);
                tlpDemo.SetColumnSpan(tlpDemo.Controls[i], columnSpan[i]);
                nextCol = nextCol + columnSpan[i];
                }

            // Add the TableLayoutPanel to the Form
            this.Controls.Add(tlpDemo);
            }
        }
    }