[SecurityPermission(SecurityAction.Demand, SerializationFormatter=true)]
public virtual void GetObjectData(SerializationInfo info, StreamingContext context)
{
     info.AddValue("schema", 10);
     info.AddValue("isVisible", this._isVisible);
     info.AddValue("color", this._color);
     info.AddValue("penWidth", this._penWidth);
     info.AddValue("symbol", this._symbol);
}