AjaxControlToolkit.TabPanel.UpdatePanelOnLoad C# (CSharp) Метод

        void UpdatePanelOnLoad(object sender, EventArgs e)
        {
            if(!(sender is UpdatePanel))
                return;

            var updatePanelID = (sender as UpdatePanel).ID;
            var tabID = updatePanelID.Substring(0, updatePanelID.Length - 12);
            if(!Active)
                return;

            var invisiblePanel = FindControl(tabID + "_onDemandPanel");
            if(invisiblePanel != null && invisiblePanel is Panel)
                invisiblePanel.Visible = true;
        }