public void SetUpFixture() { WixDocument doc = new WixDocument(); doc.LoadXml(GetWixXml()); dialogElement = (WixDialogElement)doc.SelectSingleNode("//w:Dialog", new WixNamespaceManager(doc.NameTable)); dialogElement.SetAttribute("Id", "id"); dialogElement.SetAttribute("Title", "title"); XmlElement controlElement = doc.CreateElement("Control", WixNamespaceManager.Namespace); dialogElement.AppendChild(controlElement); }