AjaxControlToolkit.TabPanel.OnInit C# (CSharp) Method

        protected override void OnInit(EventArgs e)
        {
            base.OnInit(e);

            if(_headerTemplate != null) {
                _headerControl = new Control();
                _headerTemplate.InstantiateIn(_headerControl);
                Controls.Add(_headerControl);
            }

            if(_contentTemplate == null)
                return;
            var c = new Control();
            _contentTemplate.InstantiateIn(c);

            if(_owner.OnDemand && OnDemandMode != OnDemandMode.None) {
                var invisiblePanelID = ClientID + "_onDemandPanel";
                var invisiblePanel = new Panel() {
                    ID = invisiblePanelID,
                    Visible = false
                };
                invisiblePanel.Controls.Add(c);

                var updatePanel = new UpdatePanel() {
                    ID = ClientID + "_updatePanel",
                    UpdateMode = UpdatePanelUpdateMode.Conditional
                };
                updatePanel.Load += UpdatePanelOnLoad;
                updatePanel.ContentTemplateContainer.Controls.Add(invisiblePanel);
                Controls.Add(updatePanel);
                UpdatePanelID = updatePanel.ClientID;
            } else {
                Controls.Add(c);
            }
        }