diff --git a/src/uitools/quiloader.cpp b/src/uitools/quiloader.cpp
index 13ee48aa45..7f39b557ea 100644
--- a/src/uitools/quiloader.cpp
+++ b/src/uitools/quiloader.cpp
@@ -505,7 +505,7 @@ bool FormBuilderPrivate::addItem(DomWidget *ui_widget, QWidget *widget, QWidget
 
     // Check special cases. First: Custom container
     const QString className = QLatin1String(parentWidget->metaObject()->className());
-    if (!QFormBuilderExtra::instance(this)->customWidgetAddPageMethod(className).isEmpty())
+    if (!d->customWidgetAddPageMethod(className).isEmpty())
         return true;
 
     const QFormBuilderStrings &strings = QFormBuilderStrings::instance();
diff --git a/tools/uilib/abstractformbuilder.cpp b/tools/uilib/abstractformbuilder.cpp
index ecb43db89f..e850df8f37 100644
--- a/tools/uilib/abstractformbuilder.cpp
+++ b/tools/uilib/abstractformbuilder.cpp
@@ -165,9 +165,7 @@ public:
 
 /*!
     Constructs a new form builder.*/
-QAbstractFormBuilder::QAbstractFormBuilder() :
-    m_defaultMargin(INT_MIN),
-    m_defaultSpacing(INT_MIN)
+QAbstractFormBuilder::QAbstractFormBuilder() : d(new QFormBuilderExtra)
 {
     setResourceBuilder(new QResourceBuilder());
     setTextBuilder(new QTextBuilder());
@@ -177,10 +175,8 @@ QAbstractFormBuilder::QAbstractFormBuilder() :
     Destroys the form builder.*/
 QAbstractFormBuilder::~QAbstractFormBuilder()
 {
-    QFormBuilderExtra::removeInstance(this);
 }
 
-
 /*!
     \fn QWidget *QAbstractFormBuilder::load(QIODevice *device, QWidget *parent)
 
@@ -229,11 +225,10 @@ QWidget *QAbstractFormBuilder::create(DomUI *ui, QWidget *parentWidget)
 {
     typedef QFormBuilderExtra::ButtonGroupHash ButtonGroupHash;
 
-    QFormBuilderExtra *formBuilderPrivate = QFormBuilderExtra::instance(this);
-    formBuilderPrivate->clear();
+    d->clear();
     if (const DomLayoutDefault *def = ui->elementLayoutDefault()) {
-       m_defaultMargin = def->hasAttributeMargin() ? def->attributeMargin() : INT_MIN;
-        m_defaultSpacing = def->hasAttributeSpacing() ? def->attributeSpacing() : INT_MIN;
+       d->m_defaultMargin = def->hasAttributeMargin() ? def->attributeMargin() : INT_MIN;
+       d->m_defaultSpacing = def->hasAttributeSpacing() ? def->attributeSpacing() : INT_MIN;
     }
 
     DomWidget *ui_widget = ui->elementWidget();
@@ -243,11 +238,11 @@ QWidget *QAbstractFormBuilder::create(DomUI *ui, QWidget *parentWidget)
     initialize(ui);
 
     if (const DomButtonGroups *domButtonGroups = ui->elementButtonGroups())
-        formBuilderPrivate->registerButtonGroups(domButtonGroups);
+        d->registerButtonGroups(domButtonGroups);
 
     if (QWidget *widget = create(ui_widget, parentWidget)) {
         // Reparent button groups that were actually created to main container for them to be found in the signal/slot part
-        const ButtonGroupHash &buttonGroups = formBuilderPrivate->buttonGroups();
+        const ButtonGroupHash &buttonGroups = d->buttonGroups();
         if (!buttonGroups.empty()) {
             const ButtonGroupHash::const_iterator cend = buttonGroups.constEnd();
             for (ButtonGroupHash::const_iterator it = buttonGroups.constBegin(); it != cend; ++it)
@@ -257,12 +252,12 @@ QWidget *QAbstractFormBuilder::create(DomUI *ui, QWidget *parentWidget)
         createConnections(ui->elementConnections(), widget);
         createResources(ui->elementResources()); // maybe this should go first, before create()...
         applyTabStops(widget, ui->elementTabStops());
-        formBuilderPrivate->applyInternalProperties();
+        d->applyInternalProperties();
         reset();
-        formBuilderPrivate->clear();
+        d->clear();
         return widget;
     }
-    formBuilderPrivate->clear();
+    d->clear();
     return 0;
 }
 
@@ -283,10 +278,9 @@ void QAbstractFormBuilder::initialize(const DomUI *ui)
     if (domCustomWidgets) {
         const DomCustomWidgetList customWidgets = domCustomWidgets->elementCustomWidget();
         if (!customWidgets.empty()) {
-            QFormBuilderExtra *formBuilderPrivate = QFormBuilderExtra::instance(this);
             const DomCustomWidgetList::const_iterator cend = customWidgets.constEnd();
             for (DomCustomWidgetList::const_iterator it = customWidgets.constBegin(); it != cend; ++it)
-                formBuilderPrivate->storeCustomWidgetData((*it)->elementClass(), *it);
+                d->storeCustomWidgetData((*it)->elementClass(), *it);
         }
     }
 }
@@ -337,9 +331,9 @@ QWidget *QAbstractFormBuilder::create(DomWidget *ui_widget, QWidget *parentWidge
                 sep->setSeparator(true);
                 w->addAction(sep);
                 addMenuAction(sep);
-            } else if (QAction *a = m_actions.value(name)) {
+            } else if (QAction *a = d->m_actions.value(name)) {
                 w->addAction(a);
-            } else if (QActionGroup *g = m_actionGroups.value(name)) {
+            } else if (QActionGroup *g = d->m_actionGroups.value(name)) {
                 w->addActions(g->actions());
             } else if (QMenu *menu = w->findChild<QMenu*>(name)) {
                 w->addAction(menu->menuAction());
@@ -351,9 +345,8 @@ QWidget *QAbstractFormBuilder::create(DomWidget *ui_widget, QWidget *parentWidge
     loadExtraInfo(ui_widget, w, parentWidget);
 #ifndef QT_FORMBUILDER_NO_SCRIPT
     QString scriptErrorMessage;
-    QFormBuilderExtra *extra = QFormBuilderExtra::instance(this);
-    extra->formScriptRunner().run(ui_widget,
-                                  extra->customWidgetScript(ui_widget->attributeClass()),
+    d->formScriptRunner().run(ui_widget,
+                                  d->customWidgetScript(ui_widget->attributeClass()),
                                   w, children, &scriptErrorMessage);
 #endif
     addItem(ui_widget, w, parentWidget);
@@ -388,7 +381,7 @@ QAction *QAbstractFormBuilder::create(DomAction *ui_action, QObject *parent)
     if (!a)
         return 0;
 
-    m_actions.insert(ui_action->attributeName(), a);
+    d->m_actions.insert(ui_action->attributeName(), a);
     applyProperties(a, ui_action->elementProperty());
     return a;
 }
@@ -401,7 +394,7 @@ QActionGroup *QAbstractFormBuilder::create(DomActionGroup *ui_action_group, QObj
     QActionGroup *a = createActionGroup(parent, ui_action_group->attributeName());
     if (!a)
         return 0;
-    m_actionGroups.insert(ui_action_group->attributeName(), a);
+    d->m_actionGroups.insert(ui_action_group->attributeName(), a);
     applyProperties(a, ui_action_group->elementProperty());
 
     foreach (DomAction *ui_action, ui_action_group->elementAction()) {
@@ -446,7 +439,7 @@ bool QAbstractFormBuilder::addItem(DomWidget *ui_widget, QWidget *widget, QWidge
         return true;
     // Check special cases. First: Custom container
     const QString className = QLatin1String(parentWidget->metaObject()->className());
-    const QString addPageMethod = QFormBuilderExtra::instance(this)->customWidgetAddPageMethod(className);
+    const QString addPageMethod = d->customWidgetAddPageMethod(className);
     if (!addPageMethod.isEmpty()) {
         // If this fails ( non-existent or non-slot), use ContainerExtension in Designer, else it can't be helped
         return QMetaObject::invokeMethod(parentWidget, addPageMethod.toUtf8().constData(), Qt::DirectConnection, Q_ARG(QWidget*, widget));
@@ -968,14 +961,12 @@ void QAbstractFormBuilder::applyProperties(QObject *o, const QList<DomProperty*>
     if (properties.empty())
         return;
 
-    QFormBuilderExtra *fb = QFormBuilderExtra::instance(this);
-
     const DomPropertyList::const_iterator cend = properties.constEnd();
     for (DomPropertyList::const_iterator it = properties.constBegin(); it != cend; ++it) {
         const QVariant v = toVariant(o->metaObject(), *it);
         if (!v.isNull()) {
             const  QString attributeName = (*it)->attributeName();
-            if (!fb->applyPropertyInternally(o, attributeName, v))
+            if (!d->applyPropertyInternally(o, attributeName, v))
                 o->setProperty(attributeName.toUtf8(), v);
         }
     }
@@ -990,7 +981,7 @@ void QAbstractFormBuilder::applyProperties(QObject *o, const QList<DomProperty*>
 
 bool QAbstractFormBuilder::applyPropertyInternally(QObject *o, const QString &propertyName, const QVariant &value)
 {
-    return QFormBuilderExtra::instance(this)->applyPropertyInternally(o,propertyName, value);
+    return d->applyPropertyInternally(o,propertyName, value);
 }
 
 /*!
@@ -1274,7 +1265,7 @@ void QAbstractFormBuilder::save(QIODevice *dev, QWidget *widget)
     ui->write(writer);
     writer.writeEndDocument();
 
-    m_laidout.clear();
+    d->m_laidout.clear();
 
     delete ui;
 }
@@ -1374,7 +1365,7 @@ DomWidget *QAbstractFormBuilder::createDom(QWidget *widget, DomWidget *ui_parent
 
     foreach (QObject *obj, children) {
         if (QWidget *childWidget = qobject_cast<QWidget*>(obj)) {
-            if (m_laidout.contains(childWidget) || recursive == false)
+            if (d->m_laidout.contains(childWidget) || recursive == false)
                 continue;
 
             if (QMenu *menu = qobject_cast<QMenu *>(childWidget)) {
@@ -1580,7 +1571,7 @@ DomLayoutItem *QAbstractFormBuilder::createDom(QLayoutItem *item, DomLayout *ui_
 
     if (item->widget())  {
         ui_item->setElementWidget(createDom(item->widget(), ui_parentWidget));
-        m_laidout.insert(item->widget(), true);
+        d->m_laidout.insert(item->widget(), true);
     } else if (item->layout()) {
         ui_item->setElementLayout(createDom(item->layout(), ui_layout, ui_parentWidget));
     } else if (item->spacerItem()) {
@@ -2369,7 +2360,7 @@ void QAbstractFormBuilder::saveItemViewExtraInfo(const QAbstractItemView *itemVi
 
 void QAbstractFormBuilder::setResourceBuilder(QResourceBuilder *builder)
 {
-    QFormBuilderExtra::instance(this)->setResourceBuilder(builder);
+    d->setResourceBuilder(builder);
 }
 
 /*!
@@ -2379,7 +2370,7 @@ void QAbstractFormBuilder::setResourceBuilder(QResourceBuilder *builder)
 
 QResourceBuilder *QAbstractFormBuilder::resourceBuilder() const
 {
-    return QFormBuilderExtra::instance(this)->resourceBuilder();
+    return d->resourceBuilder();
 }
 
 /*!
@@ -2389,7 +2380,7 @@ QResourceBuilder *QAbstractFormBuilder::resourceBuilder() const
 
 void QAbstractFormBuilder::setTextBuilder(QTextBuilder *builder)
 {
-    QFormBuilderExtra::instance(this)->setTextBuilder(builder);
+    d->setTextBuilder(builder);
 }
 
 /*!
@@ -2399,7 +2390,7 @@ void QAbstractFormBuilder::setTextBuilder(QTextBuilder *builder)
 
 QTextBuilder *QAbstractFormBuilder::textBuilder() const
 {
-    return QFormBuilderExtra::instance(this)->textBuilder();
+    return d->textBuilder();
 }
 
 /*!
@@ -2663,8 +2654,7 @@ void QAbstractFormBuilder::loadButtonExtraInfo(const DomWidget *ui_widget, QAbst
     if (groupName.isEmpty())
         return;
     // Find entry
-    QFormBuilderExtra *extra = QFormBuilderExtra::instance(this);
-    ButtonGroupHash &buttonGroups = extra->buttonGroups();
+    ButtonGroupHash &buttonGroups = d->buttonGroups();
     ButtonGroupHash::iterator it = buttonGroups.find(groupName);
     if (it == buttonGroups.end()) {
 #ifdef QFORMINTERNAL_NAMESPACE // Suppress the warning when copying in Designer
@@ -2796,75 +2786,13 @@ void QAbstractFormBuilder::loadExtraInfo(DomWidget *ui_widget, QWidget *widget,
     }
 }
 
-/*!
-    \internal
-*/
-QIcon QAbstractFormBuilder::nameToIcon(const QString &filePath, const QString &qrcPath)
-{
-    Q_UNUSED(filePath)
-    Q_UNUSED(qrcPath)
-    qWarning() << "QAbstractFormBuilder::nameToIcon() is obsoleted";
-    return QIcon();
-}
-
-/*!
-    \internal
-*/
-QString QAbstractFormBuilder::iconToFilePath(const QIcon &pm) const
-{
-    Q_UNUSED(pm)
-    qWarning() << "QAbstractFormBuilder::iconToFilePath() is obsoleted";
-    return QString();
-}
-
-/*!
-    \internal
-*/
-QString QAbstractFormBuilder::iconToQrcPath(const QIcon &pm) const
-{
-    Q_UNUSED(pm)
-    qWarning() << "QAbstractFormBuilder::iconToQrcPath() is obsoleted";
-    return QString();
-}
-
-/*!
-    \internal
-*/
-QPixmap QAbstractFormBuilder::nameToPixmap(const QString &filePath, const QString &qrcPath)
-{
-    Q_UNUSED(filePath)
-    Q_UNUSED(qrcPath)
-    qWarning() << "QAbstractFormBuilder::nameToPixmap() is obsoleted";
-    return QPixmap();
-}
-
-/*!
-    \internal
-*/
-QString QAbstractFormBuilder::pixmapToFilePath(const QPixmap &pm) const
-{
-    Q_UNUSED(pm)
-    qWarning() << "QAbstractFormBuilder::pixmapToFilePath() is obsoleted";
-    return QString();
-}
-
-/*!
-    \internal
-*/
-QString QAbstractFormBuilder::pixmapToQrcPath(const QPixmap &pm) const
-{
-    Q_UNUSED(pm)
-    qWarning() << "QAbstractFormBuilder::pixmapToQrcPath() is obsoleted";
-    return QString();
-}
-
 /*!
     Returns the current working directory of the form builder.
 
     \sa setWorkingDirectory() */
 QDir QAbstractFormBuilder::workingDirectory() const
 {
-    return m_workingDirectory;
+    return d->m_workingDirectory;
 }
 
 /*!
@@ -2874,7 +2802,7 @@ QDir QAbstractFormBuilder::workingDirectory() const
     \sa workingDirectory()*/
 void QAbstractFormBuilder::setWorkingDirectory(const QDir &directory)
 {
-    m_workingDirectory = directory;
+    d->m_workingDirectory = directory;
 }
 
 /*!
@@ -2948,11 +2876,11 @@ void QAbstractFormBuilder::addMenuAction(QAction *action)
 */
 void QAbstractFormBuilder::reset()
 {
-    m_laidout.clear();
-    m_actions.clear();
-    m_actionGroups.clear();
-    m_defaultMargin = INT_MIN;
-    m_defaultSpacing = INT_MIN;
+    d->m_laidout.clear();
+    d->m_actions.clear();
+    d->m_actionGroups.clear();
+    d->m_defaultMargin = INT_MIN;
+    d->m_defaultSpacing = INT_MIN;
 }
 
 /*!
@@ -3165,7 +3093,7 @@ QPixmap QAbstractFormBuilder::domPropertyToPixmap(const DomProperty* p)
 #ifndef QT_FORMBUILDER_NO_SCRIPT
 QFormScriptRunner *QAbstractFormBuilder::formScriptRunner() const
 {
-    return &(QFormBuilderExtra::instance(this)->formScriptRunner());
+    return &(d->formScriptRunner());
 }
 #endif
 
diff --git a/tools/uilib/abstractformbuilder.h b/tools/uilib/abstractformbuilder.h
index 2f99b36515..4c22570932 100644
--- a/tools/uilib/abstractformbuilder.h
+++ b/tools/uilib/abstractformbuilder.h
@@ -47,6 +47,7 @@
 #include <QtCore/QList>
 #include <QtCore/QHash>
 #include <QtCore/QDir>
+#include <QtCore/QScopedPointer>
 
 #include <QtGui/QSizePolicy>
 #include <QtGui/QPalette>
@@ -105,6 +106,7 @@ class DomResourcePixmap;
 
 class QResourceBuilder;
 class QTextBuilder;
+class QFormBuilderExtra;
 
 #ifndef QT_FORMBUILDER_NO_SCRIPT
 class QFormScriptRunner;
@@ -186,13 +188,6 @@ protected:
 
     virtual void layoutInfo(DomLayout *layout, QObject *parent, int *margin, int *spacing);
 
-    virtual QIcon nameToIcon(const QString &filePath, const QString &qrcPath);
-    virtual QString iconToFilePath(const QIcon &pm) const;
-    virtual QString iconToQrcPath(const QIcon &pm) const;
-    virtual QPixmap nameToPixmap(const QString &filePath, const QString &qrcPath);
-    virtual QString pixmapToFilePath(const QPixmap &pm) const;
-    virtual QString pixmapToQrcPath(const QPixmap &pm) const;
-
     void loadListWidgetExtraInfo(DomWidget *ui_widget, QListWidget *listWidget, QWidget *parentWidget);
     void loadTreeWidgetExtraInfo(DomWidget *ui_widget, QTreeWidget *treeWidget, QWidget *parentWidget);
     void loadTableWidgetExtraInfo(DomWidget *ui_widget, QTableWidget *tableWidget, QWidget *parentWidget);
@@ -259,13 +254,6 @@ protected:
     QPixmap domPropertyToPixmap(const DomResourcePixmap* p);
     QPixmap domPropertyToPixmap(const DomProperty* p);
 
-    QHash<QObject*, bool> m_laidout;
-    QHash<QString, QAction*> m_actions;
-    QHash<QString, QActionGroup*> m_actionGroups;
-    int m_defaultMargin;
-    int m_defaultSpacing;
-    QDir m_workingDirectory;
-
 private:
 //
 //  utils
@@ -277,6 +265,9 @@ private:
 
     friend QDESIGNER_UILIB_EXPORT DomProperty *variantToDomProperty(QAbstractFormBuilder *abstractFormBuilder, const QMetaObject *meta, const QString &propertyName, const QVariant &value);
     friend QDESIGNER_UILIB_EXPORT QVariant domPropertyToVariant(QAbstractFormBuilder *abstractFormBuilder,const QMetaObject *meta, const DomProperty *property);
+
+protected:
+    QScopedPointer<QFormBuilderExtra> d;
 };
 
 #ifdef QFORMINTERNAL_NAMESPACE
diff --git a/tools/uilib/formbuilder.cpp b/tools/uilib/formbuilder.cpp
index b997cc9bc0..592b1f15f7 100644
--- a/tools/uilib/formbuilder.cpp
+++ b/tools/uilib/formbuilder.cpp
@@ -104,7 +104,7 @@ namespace QFormInternal {
     Constructs a new form builder.
 */
 
-QFormBuilder::QFormBuilder() : QAbstractFormBuilder()
+QFormBuilder::QFormBuilder()
 {
 }
 
@@ -120,12 +120,11 @@ QFormBuilder::~QFormBuilder()
 */
 QWidget *QFormBuilder::create(DomWidget *ui_widget, QWidget *parentWidget)
 {
-    QFormBuilderExtra *fb = QFormBuilderExtra::instance(this);
-    if (!fb->parentWidgetIsSet())
-        fb->setParentWidget(parentWidget);
+    if (!d->parentWidgetIsSet())
+        d->setParentWidget(parentWidget);
     // Is this a QLayoutWidget with a margin of 0: Not a known page-based
     // container and no method for adding pages registered.
-    fb->setProcessingLayoutWidget(false);
+    d->setProcessingLayoutWidget(false);
     if (ui_widget->attributeClass() == QFormBuilderStrings::instance().qWidgetClass && !ui_widget->hasAttributeNative()
             && parentWidget
 #ifndef QT_NO_MAINWINDOW
@@ -151,8 +150,8 @@ QWidget *QFormBuilder::create(DomWidget *ui_widget, QWidget *parentWidget)
 #endif
         ) {
         const QString parentClassName = QLatin1String(parentWidget->metaObject()->className());
-        if (!fb->isCustomWidgetContainer(parentClassName))
-            fb->setProcessingLayoutWidget(true);
+        if (!d->isCustomWidgetContainer(parentClassName))
+            d->setProcessingLayoutWidget(true);
     }
     return QAbstractFormBuilder::create(ui_widget, parentWidget);
 }
@@ -212,14 +211,13 @@ QWidget *QFormBuilder::createWidget(const QString &widgetName, QWidget *parentWi
             break;
 
         // try with a registered custom widget
-        QDesignerCustomWidgetInterface *factory = m_customWidgets.value(widgetName);
+        QDesignerCustomWidgetInterface *factory = d->m_customWidgets.value(widgetName);
         if (factory != 0)
             w = factory->createWidget(parentWidget);
     } while(false);
 
-    QFormBuilderExtra *fb = QFormBuilderExtra::instance(this);
     if (w == 0) { // Attempt to instantiate base class of promoted/custom widgets
-        const QString baseClassName = fb->customWidgetBaseClass(widgetName);
+        const QString baseClassName = d->customWidgetBaseClass(widgetName);
         if (!baseClassName.isEmpty()) {
             qWarning() << QCoreApplication::translate("QFormBuilder", "QFormBuilder was unable to create a custom widget of the class '%1'; defaulting to base class '%2'.").arg(widgetName, baseClassName);
             return createWidget(baseClassName, parentWidget, name);
@@ -374,10 +372,9 @@ QWidget *QFormBuilder::create(DomUI *ui, QWidget *parentWidget)
 */
 QLayout *QFormBuilder::create(DomLayout *ui_layout, QLayout *layout, QWidget *parentWidget)
 {
-    QFormBuilderExtra *fb = QFormBuilderExtra::instance(this);
     // Is this a temporary layout widget used to represent QLayout hierarchies in Designer?
     // Set its margins to 0.
-    bool layoutWidget = fb->processingLayoutWidget();
+    bool layoutWidget = d->processingLayoutWidget();
     QLayout *l = QAbstractFormBuilder::create(ui_layout, layout, parentWidget);
     if (layoutWidget) {
         const QFormBuilderStrings &strings = QFormBuilderStrings::instance();
@@ -398,7 +395,7 @@ QLayout *QFormBuilder::create(DomLayout *ui_layout, QLayout *layout, QWidget *pa
             bottom = prop->elementNumber();
 
         l->setContentsMargins(left, top, right, bottom);
-        fb->setProcessingLayoutWidget(false);
+        d->setProcessingLayoutWidget(false);
     }
     return l;
 }
@@ -434,7 +431,7 @@ QActionGroup *QFormBuilder::create(DomActionGroup *ui_action_group, QObject *par
 */
 QStringList QFormBuilder::pluginPaths() const
 {
-    return m_pluginPaths;
+    return d->m_pluginPaths;
 }
 
 /*!
@@ -445,7 +442,7 @@ QStringList QFormBuilder::pluginPaths() const
 */
 void QFormBuilder::clearPluginPaths()
 {
-    m_pluginPaths.clear();
+    d->m_pluginPaths.clear();
     updateCustomWidgets();
 }
 
@@ -458,7 +455,7 @@ void QFormBuilder::clearPluginPaths()
 */
 void QFormBuilder::addPluginPath(const QString &pluginPath)
 {
-    m_pluginPaths.append(pluginPath);
+    d->m_pluginPaths.append(pluginPath);
     updateCustomWidgets();
 }
 
@@ -469,7 +466,7 @@ void QFormBuilder::addPluginPath(const QString &pluginPath)
 */
 void QFormBuilder::setPluginPath(const QStringList &pluginPaths)
 {
-    m_pluginPaths = pluginPaths;
+    d->m_pluginPaths = pluginPaths;
     updateCustomWidgets();
 }
 
@@ -492,9 +489,9 @@ static void insertPlugins(QObject *o, QMap<QString, QDesignerCustomWidgetInterfa
 */
 void QFormBuilder::updateCustomWidgets()
 {
-    m_customWidgets.clear();
+    d->m_customWidgets.clear();
 
-    foreach (const QString &path, m_pluginPaths) {
+    foreach (const QString &path, d->m_pluginPaths) {
         const QDir dir(path);
         const QStringList candidates = dir.entryList(QDir::Files);
 
@@ -508,14 +505,14 @@ void QFormBuilder::updateCustomWidgets()
 
             QPluginLoader loader(loaderPath);
             if (loader.load())
-                insertPlugins(loader.instance(), &m_customWidgets);
+                insertPlugins(loader.instance(), &d->m_customWidgets);
         }
     }
     // Check statically linked plugins
     const QObjectList staticPlugins = QPluginLoader::staticInstances();
     if (!staticPlugins.empty())
         foreach (QObject *o, staticPlugins)
-            insertPlugins(o, &m_customWidgets);
+            insertPlugins(o, &d->m_customWidgets);
 }
 
 /*!
@@ -525,7 +522,7 @@ void QFormBuilder::updateCustomWidgets()
 */
 QList<QDesignerCustomWidgetInterface*> QFormBuilder::customWidgets() const
 {
-    return m_customWidgets.values();
+    return d->m_customWidgets.values();
 }
 
 /*!
@@ -539,7 +536,6 @@ void QFormBuilder::applyProperties(QObject *o, const QList<DomProperty*> &proper
     if (properties.empty())
         return;
 
-    QFormBuilderExtra *fb = QFormBuilderExtra::instance(this);
     const QFormBuilderStrings &strings = QFormBuilderStrings::instance();
 
     const DomPropertyList::const_iterator cend = properties.constEnd();
@@ -550,10 +546,10 @@ void QFormBuilder::applyProperties(QObject *o, const QList<DomProperty*> &proper
 
         const QString attributeName = (*it)->attributeName();
         const bool isWidget = o->isWidgetType();
-        if (isWidget && o->parent() == fb->parentWidget() && attributeName == strings.geometryProperty) {
+        if (isWidget && o->parent() == d->parentWidget() && attributeName == strings.geometryProperty) {
             // apply only the size part of a geometry for the root widget
             static_cast<QWidget*>(o)->resize(qvariant_cast<QRect>(v).size());
-        } else if (fb->applyPropertyInternally(o, attributeName, v)) {
+        } else if (d->applyPropertyInternally(o, attributeName, v)) {
         } else if (isWidget && !qstrcmp("QFrame", o->metaObject()->className ()) && attributeName == strings.orientationProperty) {
             // ### special-casing for Line (QFrame) -- try to fix me
             o->setProperty("frameShape", v); // v is of QFrame::Shape enum
diff --git a/tools/uilib/formbuilder.h b/tools/uilib/formbuilder.h
index 1d3dc5a395..6c0820c214 100644
--- a/tools/uilib/formbuilder.h
+++ b/tools/uilib/formbuilder.h
@@ -45,9 +45,6 @@
 #include "uilib_global.h"
 #include "abstractformbuilder.h"
 
-#include <QtCore/QStringList>
-#include <QtCore/QMap>
-
 QT_BEGIN_HEADER
 
 QT_BEGIN_NAMESPACE
@@ -100,8 +97,6 @@ protected:
     static QWidget *widgetByName(QWidget *topLevel, const QString &name);
 
 private:
-    QStringList m_pluginPaths;
-    QMap<QString, QDesignerCustomWidgetInterface*> m_customWidgets;
 };
 
 #ifdef QFORMINTERNAL_NAMESPACE
diff --git a/tools/uilib/formbuilderextra.cpp b/tools/uilib/formbuilderextra.cpp
index ecc62886b9..12e43f1e38 100644
--- a/tools/uilib/formbuilderextra.cpp
+++ b/tools/uilib/formbuilderextra.cpp
@@ -55,6 +55,8 @@
 #include <QtCore/QStringList>
 #include <QtCore/QCoreApplication>
 
+#include <limits.h>
+
 QT_BEGIN_NAMESPACE
 
 #ifdef QFORMINTERNAL_NAMESPACE
@@ -83,6 +85,8 @@ QFormBuilderExtra::CustomWidgetData::CustomWidgetData(const DomCustomWidget *dcw
 }
 
 QFormBuilderExtra::QFormBuilderExtra() :
+    m_defaultMargin(INT_MIN),
+    m_defaultSpacing(INT_MIN),
     m_layoutWidget(false),
     m_resourceBuilder(0),
     m_textBuilder(0)
@@ -217,33 +221,6 @@ bool QFormBuilderExtra::isCustomWidgetContainer(const QString &className) const
     return false;
 }
 
-namespace {
-    typedef QHash<const QAbstractFormBuilder *, QFormBuilderExtra *> FormBuilderPrivateHash;
-}
-
-Q_GLOBAL_STATIC(FormBuilderPrivateHash, g_FormBuilderPrivateHash)
-
-QFormBuilderExtra *QFormBuilderExtra::instance(const QAbstractFormBuilder *afb)
-{
-    FormBuilderPrivateHash &fbHash = *g_FormBuilderPrivateHash();
-
-    FormBuilderPrivateHash::iterator it = fbHash.find(afb);
-    if (it == fbHash.end())
-        it = fbHash.insert(afb, new QFormBuilderExtra);
-    return it.value();
-}
-
-void QFormBuilderExtra::removeInstance(const QAbstractFormBuilder *afb)
-{
-    FormBuilderPrivateHash &fbHash = *g_FormBuilderPrivateHash();
-
-    FormBuilderPrivateHash::iterator it = fbHash.find(afb);
-    if (it != fbHash.end()) {
-        delete it.value();
-        fbHash.erase(it);
-    }
-}
-
 void QFormBuilderExtra::setProcessingLayoutWidget(bool processing)
 {
     m_layoutWidget = processing;
diff --git a/tools/uilib/formbuilderextra_p.h b/tools/uilib/formbuilderextra_p.h
index cac882b8d8..a5e2029391 100644
--- a/tools/uilib/formbuilderextra_p.h
+++ b/tools/uilib/formbuilderextra_p.h
@@ -61,19 +61,23 @@
 
 #include <QtCore/QHash>
 #include <QtCore/QPointer>
-#include <QtCore/QString>
+#include <QtCore/QStringList>
+#include <QtCore/QMap>
+#include <QtCore/QDir>
 
 QT_BEGIN_NAMESPACE
 
+class QDesignerCustomWidgetInterface;
 class QObject;
 class QVariant;
 class QWidget;
 class QObject;
 class QLabel;
 class QButtonGroup;
-
 class QBoxLayout;
 class QGridLayout;
+class QAction;
+class QActionGroup;
 
 #ifdef QFORMINTERNAL_NAMESPACE
 namespace QFormInternal
@@ -90,9 +94,10 @@ class QTextBuilder;
 
 class QDESIGNER_UILIB_EXPORT QFormBuilderExtra
 {
+public:
     QFormBuilderExtra();
     ~QFormBuilderExtra();
-public:
+
     struct CustomWidgetData {
         CustomWidgetData();
         explicit CustomWidgetData(const DomCustomWidget *dc);
@@ -130,9 +135,6 @@ public:
     void setTextBuilder(QTextBuilder *builder);
     QTextBuilder *textBuilder() const;
 
-    static QFormBuilderExtra *instance(const QAbstractFormBuilder *afb);
-    static void removeInstance(const QAbstractFormBuilder *afb);
-
     void storeCustomWidgetData(const QString &className, const DomCustomWidget *d);
     QString customWidgetAddPageMethod(const QString &className) const;
     QString customWidgetBaseClass(const QString &className) const;
@@ -169,6 +171,16 @@ public:
     static bool setGridLayoutColumnMinimumWidth(const QString &, QGridLayout *);
     static void clearGridLayoutColumnMinimumWidth(QGridLayout *);
 
+    QStringList m_pluginPaths;
+    QMap<QString, QDesignerCustomWidgetInterface*> m_customWidgets;
+
+    QHash<QObject*, bool> m_laidout;
+    QHash<QString, QAction*> m_actions;
+    QHash<QString, QActionGroup*> m_actionGroups;
+    int m_defaultMargin;
+    int m_defaultSpacing;
+    QDir m_workingDirectory;
+
 private:
     void clearResourceBuilder();
     void clearTextBuilder();