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diff --git a/pagelayout_editor/pl_editor_undo_redo.cpp b/pagelayout_editor/pl_editor_undo_redo.cpp
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+++ b/pagelayout_editor/pl_editor_undo_redo.cpp
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+/**
+ * @file pl_editor_undo_redo.cpp
+ * @brief page layout editor: undo and redo functions
+ */
+
+/*
+ * This program source code file is part of KiCad, a free EDA CAD application.
+ *
+ * Copyright (C) 2013 CERN
+ * @author Jean-Pierre Charras, jp.charras at wanadoo.fr
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, you may find one here:
+ * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+ * or you may search the http://www.gnu.org website for the version 2 license,
+ * or you may write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+#include <fctsys.h>
+#include <class_drawpanel.h>
+#include <macros.h>
+#include <worksheet_shape_builder.h>
+
+#include <pl_editor_frame.h>
+
+/* Note: the Undo/redo commands use a "brute" method:
+ * the full page layout is converted to a S expression, and saved as string.
+ * When a previous version is needed, the old string is parsed,
+ * and the description replaces the current desc, just like reading a new file
+ *
+ * This is not optimal from the memory point of view, but:
+ * - the descriptions are never very long (max few thousand of bytes)
+ * - this is very easy to code
+ */
+
+// A helper class used in undo/redo commad:
+class PL_ITEM_LAYOUT: public EDA_ITEM
+{
+public:
+    wxString m_Layout;
+
+public:
+    PL_ITEM_LAYOUT() : EDA_ITEM( TYPE_PL_EDITOR_LAYOUT ) {}
+
+    // Required to keep compiler happy on debug builds.
+#if defined(DEBUG)
+    virtual void Show( int nestLevel, std::ostream& os ) const {}
+#endif
+
+    /** Get class name
+     * @return  string "PL_ITEM_LAYOUT"
+     */
+    virtual wxString GetClass() const
+    {
+        return wxT( "PL_ITEM_LAYOUT" );
+    }
+};
+
+void PL_EDITOR_FRAME::SaveCopyInUndoList()
+{
+    PL_ITEM_LAYOUT* copyItem = new PL_ITEM_LAYOUT;
+    WORKSHEET_LAYOUT& pglayout = WORKSHEET_LAYOUT::GetTheInstance();
+    pglayout.SaveInString( copyItem->m_Layout );
+
+    PICKED_ITEMS_LIST* lastcmd = new PICKED_ITEMS_LIST();
+    ITEM_PICKER wrapper( copyItem, UR_LIBEDIT );
+    lastcmd->PushItem(wrapper);
+    GetScreen()->PushCommandToUndoList( lastcmd );
+
+    // Clear redo list, because after new save there is no redo to do.
+    GetScreen()->ClearUndoORRedoList( GetScreen()->m_RedoList );
+}
+
+
+/* Redo the last edition:
+ * - Place the current edited layout in undo list
+ * - Get previous version of the current edited layput
+ */
+void PL_EDITOR_FRAME::GetLayoutFromRedoList( wxCommandEvent& event )
+{
+    if ( GetScreen()->GetRedoCommandCount() <= 0 )
+        return;
+
+    PICKED_ITEMS_LIST* lastcmd = new PICKED_ITEMS_LIST();
+    PL_ITEM_LAYOUT* copyItem = new PL_ITEM_LAYOUT;
+    WORKSHEET_LAYOUT& pglayout = WORKSHEET_LAYOUT::GetTheInstance();
+    pglayout.SaveInString( copyItem->m_Layout );
+
+    ITEM_PICKER wrapper( copyItem, UR_LIBEDIT );
+
+    lastcmd->PushItem( wrapper );
+    GetScreen()->PushCommandToUndoList( lastcmd );
+
+    lastcmd = GetScreen()->PopCommandFromRedoList();
+
+    wrapper = lastcmd->PopItem();
+    copyItem = (PL_ITEM_LAYOUT*)wrapper.GetItem();
+    pglayout.SetPageLayout( TO_UTF8(copyItem->m_Layout) );
+    delete copyItem;
+
+    OnModify();
+    RebuildDesignTree();
+    m_canvas->Refresh();
+}
+
+
+/* Undo the last edition:
+ * - Place the current layout in Redo list
+ * - Get previous version of the current edited layout
+ */
+void PL_EDITOR_FRAME::GetLayoutFromUndoList( wxCommandEvent& event )
+{
+    if ( GetScreen()->GetUndoCommandCount() <= 0 )
+        return;
+
+    PICKED_ITEMS_LIST* lastcmd = new PICKED_ITEMS_LIST();
+    PL_ITEM_LAYOUT* copyItem = new PL_ITEM_LAYOUT;
+    WORKSHEET_LAYOUT& pglayout = WORKSHEET_LAYOUT::GetTheInstance();
+    pglayout.SaveInString( copyItem->m_Layout );
+
+    ITEM_PICKER wrapper( copyItem, UR_LIBEDIT );
+    lastcmd->PushItem( wrapper );
+    GetScreen()->PushCommandToRedoList( lastcmd );
+
+    lastcmd = GetScreen()->PopCommandFromUndoList();
+
+    wrapper = lastcmd->PopItem();
+    copyItem = (PL_ITEM_LAYOUT*)wrapper.GetItem();
+    pglayout.SetPageLayout( TO_UTF8(copyItem->m_Layout) );
+    delete copyItem;
+
+    OnModify();
+    RebuildDesignTree();
+    m_canvas->Refresh();
+}
+
+/* Remove the last command in Undo List.
+ * Used to clean the uUndo stack after a cancel command
+ */
+void PL_EDITOR_FRAME::RemoveLastCommandInUndoList()
+{
+    if ( GetScreen()->GetUndoCommandCount() <= 0 )
+        return;
+
+    PICKED_ITEMS_LIST* lastcmd = GetScreen()->PopCommandFromUndoList();
+
+    ITEM_PICKER wrapper = lastcmd->PopItem();
+    PL_ITEM_LAYOUT* copyItem = (PL_ITEM_LAYOUT*)wrapper.GetItem();
+    delete copyItem;
+}