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diff --git a/sd/source/ui/inc/FormShellManager.hxx b/sd/source/ui/inc/FormShellManager.hxx
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+++ b/sd/source/ui/inc/FormShellManager.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#pragma once
+
+#include "ViewShellManager.hxx"
+
+#include <tools/link.hxx>
+#include <svl/lstner.hxx>
+#include <vcl/vclptr.hxx>
+
+class VclWindowEvent;
+class FmFormShell;
+namespace vcl
+{
+class Window;
+}
+
+namespace sd::tools
+{
+class EventMultiplexerEvent;
+}
+
+namespace sd
+{
+class ViewShellBase;
+
+/** This simple class is responsible for putting the form shell above or
+    below the main view shell on the shell stack maintained by the ObjectBarManager.
+
+    The form shell is moved above the view shell when the form shell is
+    activated, i.e. the FormControlActivated handler is called.
+
+    It is moved below the view shell when the main window of the
+    main view shell is focused.
+
+    The form shell is created and destroyed by the ViewShellManager by using
+    a factory object provided by the FormShellManager.
+*/
+class FormShellManager : public SfxListener
+{
+public:
+    FormShellManager(ViewShellBase& rBase);
+    virtual ~FormShellManager() override;
+
+    /** Typically called by a ShellFactory.  It tells the
+        FormShellManager which form shell to manage.
+        @param pFormShell
+            This may be <NULL/> to disconnect the ViewShellManager from the
+            form shell.
+    */
+    void SetFormShell(FmFormShell* pFormShell);
+
+    /** Return the form shell last set with SetFormShell().
+        @return
+            The result may be <NULL/> when the SetFormShell() method has not
+            yet been called or was last called with <NULL/>.
+    */
+    FmFormShell* GetFormShell() { return mpFormShell; }
+
+private:
+    ViewShellBase& mrBase;
+
+    /** Ownership of the form shell lies with the ViewShellManager.  This
+        reference is kept so that the FormShellManager can detect when a new
+        form shell is passed to SetFormShell().
+    */
+    FmFormShell* mpFormShell;
+
+    /** Remember whether the form shell is currently above or below the main
+        view shell.
+    */
+    bool mbFormShellAboveViewShell;
+
+    /** The factory is remembered so that it removed from the
+        ViewShellManager when the FormShellManager is destroyed.
+    */
+    ViewShellManager::SharedShellFactory mpSubShellFactory;
+
+    bool mbIsMainViewChangePending;
+
+    VclPtr<vcl::Window> mpMainViewShellWindow;
+
+    /** Register at window of center pane and at the form shell that
+        represents the form tool bar.  The former informs this manager about
+        the deselection of the form shell.  The later informs about its
+        selection.
+    */
+    void RegisterAtCenterPane();
+
+    /** Unregister the listeners that were registered in
+        RegisterAtCenterPane().
+    */
+    void UnregisterAtCenterPane();
+
+    /** This call back is called by the application window (among others)
+        when the window gets the focus.  In this case the form shell is
+        moved to the bottom of the shell stack.
+    */
+    DECL_LINK(WindowEventHandler, VclWindowEvent&, void);
+
+    /** This call back is called when view in the center pane is replaced.
+        When this happens then we unregister at the window of the old and
+        register at the window of the new shell.
+    */
+    DECL_LINK(ConfigurationUpdateHandler, ::sd::tools::EventMultiplexerEvent&, void);
+
+    /** This call back is called by the form shell when it gets the focus.
+        In this case the form shell is moved to the top of the shell stack.
+    */
+    DECL_LINK(FormControlActivated, LinkParamNone*, void);
+
+    /** This method is called by the form shell when that is destroyed.  It
+        acts as a last resort against referencing a dead form shell.  With
+        the factory working properly this method should not be necessary
+        (and may be removed in the future.)
+    */
+    virtual void Notify(SfxBroadcaster& rBC, const SfxHint& rHint) override;
+};
+
+} // end of namespace sd
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */