private void toggleColumnStylesBtn_Click(
    System.Object sender, 
    System.EventArgs e)
{
    TableLayoutColumnStyleCollection styles = 
        this.TableLayoutPanel1.ColumnStyles;

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

            // Set the column width to be a percentage
            // of the TableLayoutPanel control's width.
            style.Width = 33;
        }
        else
        {
            // Set the column width to 50 pixels.
            style.SizeType = SizeType.Absolute;
            style.Width = 50;
        }
    }
}