/// <summary>
        /// The page_ pre render.
        /// </summary>
        /// <param name="sender">
        /// The sender.
        /// </param>
        /// <param name="e">
        /// The e.
        /// </param>
        protected void Page_PreRender([NotNull] object sender, [NotNull] EventArgs e)
        {
            this.trHeader.Visible = this.ShowHeader;
        }