private void SaveUserDefines(XmlDocument project, XmlElement parent){
XmlElement userDefines = project.CreateElement("Defines");
if (this.Defines != null){
foreach (string key in this.Defines.Keys){
this.AddChildAndValue(project, userDefines, key, (string)this.Defines[key]);
}
}
parent.AppendChild(userDefines);
}