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diff --git a/src/designer/src/components/formeditor/formwindow_widgetstack.cpp b/src/designer/src/components/formeditor/formwindow_widgetstack.cpp
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+++ b/src/designer/src/components/formeditor/formwindow_widgetstack.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the Qt Designer of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "formwindow_widgetstack.h"
+#include <QtDesigner/QDesignerFormWindowToolInterface>
+
+#include <QtGui/QWidget>
+#include <QtGui/qevent.h>
+#include <QtGui/QAction>
+#include <QtGui/QStackedLayout>
+#include <QtGui/QVBoxLayout>
+
+#include <QtCore/qdebug.h>
+
+QT_BEGIN_NAMESPACE
+
+using namespace qdesigner_internal;
+
+FormWindowWidgetStack::FormWindowWidgetStack(QObject *parent) :
+    QObject(parent),
+    m_formContainer(new QWidget),
+    m_formContainerLayout(new QStackedLayout),
+    m_layout(new QStackedLayout)
+{
+    m_layout->setMargin(0);
+    m_layout->setSpacing(0);
+    m_layout->setStackingMode(QStackedLayout::StackAll);
+
+    // We choose a QStackedLayout as immediate layout for
+    // the form windows as it ignores the sizePolicy of
+    // its child (for example, Fixed would cause undesired side effects).
+    m_formContainerLayout->setMargin(0);
+    m_formContainer->setObjectName(QLatin1String("formContainer"));
+    m_formContainer->setLayout(m_formContainerLayout);
+    m_formContainerLayout->setStackingMode(QStackedLayout::StackAll);
+    // System settings might have different background colors, autofill them
+    // (affects for example mainwindow status bars)
+    m_formContainer->setAutoFillBackground(true);
+}
+
+FormWindowWidgetStack::~FormWindowWidgetStack()
+{
+}
+
+int FormWindowWidgetStack::count() const
+{
+    return m_tools.count();
+}
+
+QDesignerFormWindowToolInterface *FormWindowWidgetStack::currentTool() const
+{
+    return tool(currentIndex());
+}
+
+void FormWindowWidgetStack::setCurrentTool(int index)
+{
+    const int cnt = count();
+    if (index < 0 || index >= cnt) {
+        qDebug("FormWindowWidgetStack::setCurrentTool(): invalid index: %d", index);
+        return;
+    }
+
+    const int cur = currentIndex();
+    if (index == cur)
+        return;
+
+    if (cur != -1)
+        m_tools.at(cur)->deactivated();
+
+
+    m_layout->setCurrentIndex(index);
+    // Show the widget editor and the current tool
+    for (int i = 0; i < cnt; i++)
+        m_tools.at(i)->editor()->setVisible(i == 0 || i == index);
+
+    QDesignerFormWindowToolInterface *tool = m_tools.at(index);
+    tool->activated();
+
+    emit currentToolChanged(index);
+}
+
+void FormWindowWidgetStack::setSenderAsCurrentTool()
+{
+    QDesignerFormWindowToolInterface *tool = 0;
+    QAction *action = qobject_cast<QAction*>(sender());
+    if (action == 0) {
+        qDebug("FormWindowWidgetStack::setSenderAsCurrentTool(): sender is not a QAction");
+        return;
+    }
+
+    foreach (QDesignerFormWindowToolInterface *t, m_tools) {
+        if (action == t->action()) {
+            tool = t;
+            break;
+        }
+    }
+
+    if (tool == 0) {
+        qDebug("FormWindowWidgetStack::setSenderAsCurrentTool(): unknown tool");
+        return;
+    }
+
+    setCurrentTool(tool);
+}
+
+int FormWindowWidgetStack::indexOf(QDesignerFormWindowToolInterface *tool) const
+{
+    return m_tools.indexOf(tool);
+}
+
+void FormWindowWidgetStack::setCurrentTool(QDesignerFormWindowToolInterface *tool)
+{
+    int index = indexOf(tool);
+    if (index == -1) {
+        qDebug("FormWindowWidgetStack::setCurrentTool(): unknown tool");
+        return;
+    }
+
+    setCurrentTool(index);
+}
+
+void FormWindowWidgetStack::setMainContainer(QWidget *w)
+{
+    // This code is triggered once by the formwindow and
+    // by integrations doing "revert to saved". Anything changing?
+    const int previousCount = m_formContainerLayout->count();
+    QWidget *previousMainContainer = previousCount ? m_formContainerLayout->itemAt(0)->widget() : static_cast<QWidget*>(0);
+    if (previousMainContainer == w)
+        return;
+    // Swap
+    if (previousCount)
+        delete m_formContainerLayout->takeAt(0);
+    if (w)
+        m_formContainerLayout->addWidget(w);
+}
+
+void FormWindowWidgetStack::addTool(QDesignerFormWindowToolInterface *tool)
+{
+    if (QWidget *w = tool->editor()) {
+        w->setVisible(m_layout->count() == 0); // Initially only form editor is visible
+        m_layout->addWidget(w);
+    } else {
+        // The form editor might not have a tool initially, use dummy. Assert on anything else
+        Q_ASSERT(m_tools.empty());
+        m_layout->addWidget(m_formContainer);
+    }
+
+    m_tools.append(tool);
+
+    connect(tool->action(), SIGNAL(triggered()), this, SLOT(setSenderAsCurrentTool()));
+}
+
+QDesignerFormWindowToolInterface *FormWindowWidgetStack::tool(int index) const
+{
+    if (index < 0 || index >= count())
+        return 0;
+
+    return m_tools.at(index);
+}
+
+int FormWindowWidgetStack::currentIndex() const
+{
+    return m_layout->currentIndex();
+}
+
+QWidget *FormWindowWidgetStack::defaultEditor() const
+{
+    if (m_tools.isEmpty())
+        return 0;
+
+    return m_tools.at(0)->editor();
+}
+
+QLayout *FormWindowWidgetStack::layout() const
+{
+    return m_layout;
+}
+
+QT_END_NAMESPACE