public override void ToXML(System.Xml.XmlWriter writer)
{
writer.WriteStartElement("level");
writer.WriteAttributeString("name", this.Name);
writer.WriteAttributeString("nextLevel", this.NextLevel);
writer.WriteAttributeString("background", this.Background);
writer.WriteAttributeString("foreground", this.Foreground);
writer.WriteAttributeString("width", this.size.Width.ToString());
writer.WriteAttributeString("height", this.size.Height.ToString());
}