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diff --git a/examples/charts/stackedbarchartdrilldown/drilldownseries.h b/examples/charts/stackedbarchartdrilldown/drilldownseries.h
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+++ b/examples/charts/stackedbarchartdrilldown/drilldownseries.h
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+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc
+** All rights reserved.
+** For any questions to Digia, please use contact form at http://qt.digia.com
+**
+** This file is part of the Qt Enterprise Charts Add-on.
+**
+** $QT_BEGIN_LICENSE$
+** Licensees holding valid Qt Enterprise licenses may use this file in
+** accordance with the Qt Enterprise License Agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.
+**
+** If you have questions regarding the use of this file, please use
+** contact form at http://qt.digia.com
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef DRILLDOWNSERIES_H
+#define DRILLDOWNSERIES_H
+
+#include <QStackedBarSeries>
+#include <QMap>
+
+QT_CHARTS_USE_NAMESPACE
+
+//! [1]
+class DrilldownBarSeries : public QStackedBarSeries
+{
+    Q_OBJECT
+public:
+    DrilldownBarSeries(QStringList categories, QObject *parent = 0);
+
+    void mapDrilldownSeries(int index, DrilldownBarSeries *drilldownSeries);
+
+    DrilldownBarSeries *drilldownSeries(int index);
+
+    QStringList categories();
+
+private:
+    QMap<int, DrilldownBarSeries *> m_DrilldownSeries;
+    QStringList m_categories;
+};
+//! [1]
+
+#endif // DRILLDOWNSERIES_H