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diff --git a/src/controls/qtexclusivegroup.cpp b/src/controls/qtexclusivegroup.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the Qt Components project.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** 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 Digia Plc 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."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qtexclusivegroup_p.h"
+
+#include <QtCore/QVariant>
+#include <QtCore/qdebug.h>
+
+#define CHECKED_PROPERTY "checked"
+
+QT_BEGIN_NAMESPACE
+
+static const char *checkableSignals[] = {
+    CHECKED_PROPERTY"Changed()",
+    "toggled(bool)",
+    "toggled()",
+    0
+};
+
+static bool isChecked(const QObject *o)
+{
+    if (!o) return false;
+    QVariant checkedVariant = o->property(CHECKED_PROPERTY);
+    return checkedVariant.isValid() && checkedVariant.toBool();
+}
+
+/*!
+    \qmltype ExclusiveGroup
+    \instantiates QtExclusiveGroup
+    \inqmlmodule QtQuick.Controls 1.0
+    \ingroup containers
+    \brief ExclusiveGroup provides a way to declare several checkable controls as mutually exclusive.
+
+    \code
+    ExclusiveGroup { id: radioInputGroup }
+
+    Action {
+        id: dabRadioInput
+        text: "DAB"
+        exclusiveGroup: radioInputGroup
+    }
+
+    Action {
+        id: fmRadioInput
+        text: "FM"
+        exclusiveGroup: radioInputGroup
+    }
+
+    Action {
+        id: amRadioInput
+        text: "AM"
+        exclusiveGroup: radioInputGroup
+    }
+
+    \endcode
+
+    For an object, or control, to be compatible with \c ExclusiveGroup, it should have a \c checked
+    property, and either a \c checkedChanged, \c toggled(), or \c toggled(bool) signal. It also needs
+    to be registered with \c ExclusiveGroup::registerCheckable(object) when its \c ExclusiveGroup property is set.
+
+    \sa Action, ButtonBehavior
+*/
+
+/*!
+    \qmlproperty QtObject ExclusiveGroup::current
+
+    The currently selected object.
+*/
+
+/*!
+    \qmlmethod void ExclusiveGroup::registerCheckable(object)
+
+    Register \c object to the exclusive group.
+
+    You should only need to call this function when creating a component you want to be compatible with \c ExclusiveGroup.
+
+    \sa ExclusiveGroup::unregisterCheckable(object)
+*/
+
+/*!
+    \qmlmethod void ExclusiveGroup::unregisterCheckable(object)
+
+    Unregister \c object from the exclusive group.
+
+    You should only need to call this function when creating a component you want to be compatible with \c ExclusiveGroup.
+
+    \sa ExclusiveGroup::registerCheckable(object)
+*/
+
+QtExclusiveGroup::QtExclusiveGroup(QObject *parent)
+    : QObject(parent)
+{
+    int index = metaObject()->indexOfMethod("updateCurrent()");
+    m_updateCurrentMethod = metaObject()->method(index);
+}
+
+void QtExclusiveGroup::setCurrent(QObject * o)
+{
+    if (m_current == o)
+        return;
+
+    if (m_current)
+        m_current->setProperty(CHECKED_PROPERTY, QVariant(false));
+    m_current = o;
+    if (m_current)
+        m_current->setProperty(CHECKED_PROPERTY, QVariant(true));
+    emit currentChanged();
+}
+
+void QtExclusiveGroup::updateCurrent()
+{
+    QObject *checkable = sender();
+    if (isChecked(checkable))
+        setCurrent(checkable);
+}
+
+void QtExclusiveGroup::registerCheckable(QObject *o)
+{
+    for (const char **signalName = checkableSignals; *signalName; signalName++) {
+        int signalIndex = o->metaObject()->indexOfSignal(*signalName);
+        if (signalIndex != -1) {
+            QMetaMethod signalMethod = o->metaObject()->method(signalIndex);
+            connect(o, signalMethod, this, m_updateCurrentMethod, Qt::UniqueConnection);
+            connect(o, SIGNAL(destroyed(QObject*)), this, SLOT(unregisterCheckable(QObject*)), Qt::UniqueConnection);
+            if (!m_current && isChecked(o))
+                setCurrent(o);
+            return;
+        }
+    }
+
+    qWarning() << "QtExclusiveGroup::registerCheckable(): Cannot register" << o;
+}
+
+void QtExclusiveGroup::unregisterCheckable(QObject *o)
+{
+    for (const char **signalName = checkableSignals; *signalName; signalName++) {
+        int signalIndex = o->metaObject()->indexOfSignal(*signalName);
+        if (signalIndex != -1) {
+            QMetaMethod signalMethod = o->metaObject()->method(signalIndex);
+            if (disconnect(o, signalMethod, this, m_updateCurrentMethod)) {
+                disconnect(o, SIGNAL(destroyed(QObject*)), this, SLOT(unregisterCheckable(QObject*)));
+                break;
+            }
+        }
+    }
+}
+
+QT_END_NAMESPACE