public static void SaveAsXml(DockPanel dockPanel, Stream stream, Encoding encoding, bool upstream)
            {
                XmlWriter xmlOut = XmlWriter.Create(stream, new XmlWriterSettings()
                {
                    Encoding = encoding, Indent = true
                });

                if (!upstream)
                {
                    xmlOut.WriteStartDocument();
                }

                // Always begin file with identification and warning
                xmlOut.WriteComment(Strings.DockPanel_Persistor_XmlFileComment1);
                xmlOut.WriteComment(Strings.DockPanel_Persistor_XmlFileComment2);

                // Associate a version number with the root element so that future version of the code
                // will be able to be backwards compatible or at least recognise out of date versions
                xmlOut.WriteStartElement("DockPanel");
                xmlOut.WriteAttributeString("FormatVersion", ConfigFileVersion);
                xmlOut.WriteAttributeString("DockLeftPortion", dockPanel.DockLeftPortion.ToString(CultureInfo.InvariantCulture));
                xmlOut.WriteAttributeString("DockRightPortion", dockPanel.DockRightPortion.ToString(CultureInfo.InvariantCulture));
                xmlOut.WriteAttributeString("DockTopPortion", dockPanel.DockTopPortion.ToString(CultureInfo.InvariantCulture));
                xmlOut.WriteAttributeString("DockBottomPortion", dockPanel.DockBottomPortion.ToString(CultureInfo.InvariantCulture));

                if (!Win32Helper.IsRunningOnMono)
                {
                    xmlOut.WriteAttributeString("ActiveDocumentPane", dockPanel.Panes.IndexOf(dockPanel.ActiveDocumentPane).ToString(CultureInfo.InvariantCulture));
                    xmlOut.WriteAttributeString("ActivePane", dockPanel.Panes.IndexOf(dockPanel.ActivePane).ToString(CultureInfo.InvariantCulture));
                }

                // Contents
                xmlOut.WriteStartElement("Contents");
                xmlOut.WriteAttributeString("Count", dockPanel.Contents.Count.ToString(CultureInfo.InvariantCulture));
                foreach (IDockContent content in dockPanel.Contents)
                {
                    xmlOut.WriteStartElement("Content");
                    xmlOut.WriteAttributeString("ID", dockPanel.Contents.IndexOf(content).ToString(CultureInfo.InvariantCulture));
                    xmlOut.WriteAttributeString("PersistString", content.DockHandler.PersistString);
                    xmlOut.WriteAttributeString("AutoHidePortion", content.DockHandler.AutoHidePortion.ToString(CultureInfo.InvariantCulture));
                    xmlOut.WriteAttributeString("IsHidden", content.DockHandler.IsHidden.ToString(CultureInfo.InvariantCulture));
                    xmlOut.WriteAttributeString("IsFloat", content.DockHandler.IsFloat.ToString(CultureInfo.InvariantCulture));
                    xmlOut.WriteEndElement();
                }
                xmlOut.WriteEndElement();

                // Panes
                xmlOut.WriteStartElement("Panes");
                xmlOut.WriteAttributeString("Count", dockPanel.Panes.Count.ToString(CultureInfo.InvariantCulture));
                foreach (DockPane pane in dockPanel.Panes)
                {
                    xmlOut.WriteStartElement("Pane");
                    xmlOut.WriteAttributeString("ID", dockPanel.Panes.IndexOf(pane).ToString(CultureInfo.InvariantCulture));
                    xmlOut.WriteAttributeString("DockState", pane.DockState.ToString());
                    xmlOut.WriteAttributeString("ActiveContent", dockPanel.Contents.IndexOf(pane.ActiveContent).ToString(CultureInfo.InvariantCulture));
                    xmlOut.WriteStartElement("Contents");
                    xmlOut.WriteAttributeString("Count", pane.Contents.Count.ToString(CultureInfo.InvariantCulture));
                    foreach (IDockContent content in pane.Contents)
                    {
                        xmlOut.WriteStartElement("Content");
                        xmlOut.WriteAttributeString("ID", pane.Contents.IndexOf(content).ToString(CultureInfo.InvariantCulture));
                        xmlOut.WriteAttributeString("RefID", dockPanel.Contents.IndexOf(content).ToString(CultureInfo.InvariantCulture));
                        xmlOut.WriteEndElement();
                    }
                    xmlOut.WriteEndElement();
                    xmlOut.WriteEndElement();
                }
                xmlOut.WriteEndElement();

                // DockWindows
                xmlOut.WriteStartElement("DockWindows");
                int dockWindowId = 0;

                foreach (DockWindow dw in dockPanel.DockWindows)
                {
                    xmlOut.WriteStartElement("DockWindow");
                    xmlOut.WriteAttributeString("ID", dockWindowId.ToString(CultureInfo.InvariantCulture));
                    dockWindowId++;
                    xmlOut.WriteAttributeString("DockState", dw.DockState.ToString());
                    xmlOut.WriteAttributeString("ZOrderIndex", dockPanel.Controls.IndexOf(dw).ToString(CultureInfo.InvariantCulture));
                    xmlOut.WriteStartElement("NestedPanes");
                    xmlOut.WriteAttributeString("Count", dw.NestedPanes.Count.ToString(CultureInfo.InvariantCulture));
                    foreach (DockPane pane in dw.NestedPanes)
                    {
                        xmlOut.WriteStartElement("Pane");
                        xmlOut.WriteAttributeString("ID", dw.NestedPanes.IndexOf(pane).ToString(CultureInfo.InvariantCulture));
                        xmlOut.WriteAttributeString("RefID", dockPanel.Panes.IndexOf(pane).ToString(CultureInfo.InvariantCulture));
                        NestedDockingStatus status = pane.NestedDockingStatus;
                        xmlOut.WriteAttributeString("PrevPane", dockPanel.Panes.IndexOf(status.PreviousPane).ToString(CultureInfo.InvariantCulture));
                        xmlOut.WriteAttributeString("Alignment", status.Alignment.ToString());
                        xmlOut.WriteAttributeString("Proportion", status.Proportion.ToString(CultureInfo.InvariantCulture));
                        xmlOut.WriteEndElement();
                    }
                    xmlOut.WriteEndElement();
                    xmlOut.WriteEndElement();
                }
                xmlOut.WriteEndElement();

                // FloatWindows
                RectangleConverter rectConverter = new RectangleConverter();

                xmlOut.WriteStartElement("FloatWindows");
                xmlOut.WriteAttributeString("Count", dockPanel.FloatWindows.Count.ToString(CultureInfo.InvariantCulture));
                foreach (FloatWindow fw in dockPanel.FloatWindows)
                {
                    xmlOut.WriteStartElement("FloatWindow");
                    xmlOut.WriteAttributeString("ID", dockPanel.FloatWindows.IndexOf(fw).ToString(CultureInfo.InvariantCulture));
                    xmlOut.WriteAttributeString("Bounds", rectConverter.ConvertToInvariantString(fw.Bounds));
                    xmlOut.WriteAttributeString("ZOrderIndex", fw.DockPanel.FloatWindows.IndexOf(fw).ToString(CultureInfo.InvariantCulture));
                    xmlOut.WriteStartElement("NestedPanes");
                    xmlOut.WriteAttributeString("Count", fw.NestedPanes.Count.ToString(CultureInfo.InvariantCulture));
                    foreach (DockPane pane in fw.NestedPanes)
                    {
                        xmlOut.WriteStartElement("Pane");
                        xmlOut.WriteAttributeString("ID", fw.NestedPanes.IndexOf(pane).ToString(CultureInfo.InvariantCulture));
                        xmlOut.WriteAttributeString("RefID", dockPanel.Panes.IndexOf(pane).ToString(CultureInfo.InvariantCulture));
                        NestedDockingStatus status = pane.NestedDockingStatus;
                        xmlOut.WriteAttributeString("PrevPane", dockPanel.Panes.IndexOf(status.PreviousPane).ToString(CultureInfo.InvariantCulture));
                        xmlOut.WriteAttributeString("Alignment", status.Alignment.ToString());
                        xmlOut.WriteAttributeString("Proportion", status.Proportion.ToString(CultureInfo.InvariantCulture));
                        xmlOut.WriteEndElement();
                    }
                    xmlOut.WriteEndElement();
                    xmlOut.WriteEndElement();
                }
                xmlOut.WriteEndElement();   //	</FloatWindows>

                xmlOut.WriteEndElement();

                if (!upstream)
                {
                    xmlOut.WriteEndDocument();
                    xmlOut.Close();
                }
                else
                {
                    xmlOut.Flush();
                }
            }