or
Dim notification As New RadNotification and then try to show it: notification.Show()
<telerik:RadComboBox ID="rcbProducts" runat="server" EmptyMessage="Select a product" AllowCustomText="true" AppendDataBoundItems="true" DataTextField="ProductName" ToolTip="ProductDescription" HighlightTemplatedItems="true"> <ItemTemplate> <div onmouseover='showToolTip(this);' title='<%# Eval("ProductDescription")%>' style='width: 100%;'> <%# Eval("ProductName")%></div> </ItemTemplate> </telerik:RadComboBox>function Add() { var combo = $find("<%= rcbProducts.ClientID %>"); var comboItem = new Telerik.Web.UI.RadComboBoxItem(); comboItem.set_text("New Item"); var div = document.createElement("div"); div.setAttribute("onmouseover", "showToolTip(this);"); div.setAttribute("title", "New Item"); div.setAttribute("style", "width: 100%;"); div.innerHTML = "New Item"; comboItem.set_element(div);//It doesnt set div as element??? combo.get_items().add(comboItem); comboItem.select(); return false; }