public IEnumerable<object> Render(PanelItem panelItem) { var dropdowntreeview = new DropDownTreeView { ID = panelItem.GetId(), Enabled = false, CssClass = "AdfPanelItem AdfTreeView", Width = new Unit(panelItem.Width, UnitType.Ex), Visible = panelItem.Visible }; dropdowntreeview.AttachToolTip(panelItem); panelItem.Target = dropdowntreeview; return new List<Control> { dropdowntreeview, PanelValidator.Create(panelItem) }; }