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);
}