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diff --git a/doc/src/snippets/code/doc_src_designer-manual.cpp b/doc/src/snippets/code/doc_src_designer-manual.cpp
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@@ -0,0 +1,112 @@
+/****************************************************************************
+**
+** 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 documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
+**     the names of its contributors may be used to endorse or promote
+**     products derived from this software without specific prior written
+**     permission.
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//! [1]
+#include <QtUiTools>
+//! [1]
+
+
+//! [2]
+void on_<object name>_<signal name>(<signal parameters>);
+//! [2]
+
+
+//! [7]
+class MyExtension: public QObject,
+                   public QdesignerContainerExtension
+{
+    Q_OBJECT
+    Q_INTERFACE(QDesignerContainerExtension)
+
+    ...
+}
+//! [7]
+
+
+//! [8]
+QObject *ANewExtensionFactory::createExtension(QObject *object,
+        const QString &iid, QObject *parent) const
+{
+    if (iid != Q_TYPEID(QDesignerContainerExtension))
+        return 0;
+
+    if (MyCustomWidget *widget = qobject_cast<MyCustomWidget*>
+            (object))
+        return new MyContainerExtension(widget, parent);
+
+    return 0;
+}
+//! [8]
+
+
+//! [9]
+QObject *AGeneralExtensionFactory::createExtension(QObject *object,
+        const QString &iid, QObject *parent) const
+{
+    MyCustomWidget *widget = qobject_cast<MyCustomWidget*>(object);
+
+    if (widget && (iid == Q_TYPEID(QDesignerTaskMenuExtension))) {
+         return new MyTaskMenuExtension(widget, parent);
+
+    } else if (widget && (iid == Q_TYPEID(QDesignerContainerExtension))) {
+        return new MyContainerExtension(widget, parent);
+
+    } else {
+        return 0;
+    }
+}
+//! [9]
+
+
+//! [10]
+void MyPlugin::initialize(QDesignerFormEditorInterface *formEditor)
+{
+    if (initialized)
+        return;
+
+    QExtensionManager *manager = formEditor->extensionManager();
+    Q_ASSERT(manager != 0);
+
+    manager->registerExtensions(new MyExtensionFactory(manager),
+                                Q_TYPEID(QDesignerTaskMenuExtension));
+
+    initialized = true;
+}
+//! [10]