private void toggleRowStylesBtn_Click(
    System.Object sender, 
    System.EventArgs e)
{
    TableLayoutRowStyleCollection styles = 
        this.TableLayoutPanel1.RowStyles;

    foreach( RowStyle style in styles )
    {
        if (style.SizeType==SizeType.Absolute)
        {
            style.SizeType = SizeType.AutoSize;
        }
        else if(style.SizeType==SizeType.AutoSize)
        {
            style.SizeType = SizeType.Percent;

            // Set the row height to be a percentage
            // of the TableLayoutPanel control's height.
            style.Height = 33;
        }
        else
        {

            // Set the row height to 50 pixels.
            style.SizeType = SizeType.Absolute;
            style.Height = 50;
        }
    }
}