or
protected void ContextGrid_ItemCommand(object source, Telerik.Web.UI.GridCommandEventArgs e){ RadTabStrip tabStrip = (RadTabStrip)this.Page.FindControl("DetailTabStrip"); RadTab tab = new RadTab(); tab.Text = "My Tab 1"; tabStrip.InnermostSelectedTab.Tabs.Add(tab);}<telerik:RadContextMenu ID="appointmentContextMenu" runat="server" OnClientItemClicked="appointmentitem_clicked"> <Items> <telerik:RadMenuItem Text="Edit Details" Value="EventDetails" /> <telerik:RadMenuItem Text="Edit Assets" Value="EventAssets" /> <telerik:RadMenuItem Text="Edit Resources" Value="EventResources" /> <telerik:RadMenuItem Text="Delete Event" Value="DeleteEvent" /> <telerik:RadMenuItem Text="Event Outline" Value="EventOutline" /> </Items> </telerik:RadContextMenu>