diff --git a/src/barchart/qbarmodelmapper.cpp b/src/barchart/qbarmodelmapper.cpp
index ef7dd0f..8df444b 100644
--- a/src/barchart/qbarmodelmapper.cpp
+++ b/src/barchart/qbarmodelmapper.cpp
@@ -68,6 +68,30 @@ QTCOMMERCIALCHART_BEGIN_NAMESPACE
 */
 
 /*!
+    \fn void QBarModelMapper::seriesReplaced()
+
+    Emitted when the series to which mapper is connected to has changed.
+*/
+
+/*!
+    \fn void QBarModelMapper::modelReplaced()
+
+    Emitted when the model to which mapper is connected to has changed.
+*/
+
+/*!
+    \fn void QBarModelMapper::firstChanged()
+
+    Emitted when the value for the first has changed.
+*/
+
+/*!
+    \fn void QBarModelMapper::countChanged()
+
+    Emitted when the value for the count has changed.
+*/
+
+/*!
     Constructs a mapper object which is a child of \a parent.
 */
 QBarModelMapper::QBarModelMapper(QObject *parent) :
@@ -101,6 +125,8 @@ void QBarModelMapper::setModel(QAbstractItemModel *model)
     connect(d->m_model, SIGNAL(rowsRemoved(QModelIndex,int,int)), d, SLOT(modelRowsRemoved(QModelIndex,int,int)));
     connect(d->m_model, SIGNAL(columnsInserted(QModelIndex,int,int)), d, SLOT(modelColumnsAdded(QModelIndex,int,int)));
     connect(d->m_model, SIGNAL(columnsRemoved(QModelIndex,int,int)), d, SLOT(modelColumnsRemoved(QModelIndex,int,int)));
+
+    emit modelReplaced();
 }
 
 QBarSeries* QBarModelMapper::series() const
@@ -124,6 +150,8 @@ void QBarModelMapper::setSeries(QBarSeries *series)
     // connect the signals from the series
     connect(d->m_series, SIGNAL(barsetsAdded(QList<QBarSet*>)), d, SLOT(barSetsAdded(QList<QBarSet*>)));
     connect(d->m_series, SIGNAL(barsetsRemoved(QList<QBarSet*>)), d, SLOT(barSetsRemoved(QList<QBarSet*>)));
+
+    emit seriesReplaced();
 }
 
 int QBarModelMapper::first() const
@@ -135,8 +163,12 @@ int QBarModelMapper::first() const
 void QBarModelMapper::setFirst(int first)
 {
     Q_D(QBarModelMapper);
-    d->m_first = qMax(first, 0);
-    d->initializeBarFromModel();
+    if (first != d->m_first) {
+        d->m_first = qMax(first, 0);
+        d->initializeBarFromModel();
+
+        emit firstChanged();
+    }
 }
 
 int QBarModelMapper::count() const
@@ -148,8 +180,12 @@ int QBarModelMapper::count() const
 void QBarModelMapper::setCount(int count)
 {
     Q_D(QBarModelMapper);
-    d->m_count = qMax(count, -1);
-    d->initializeBarFromModel();
+    if (count != d->m_count) {
+        d->m_count = qMax(count, -1);
+        d->initializeBarFromModel();
+
+        emit countChanged();
+    }
 }
 
 /*!
diff --git a/src/barchart/qbarmodelmapper.h b/src/barchart/qbarmodelmapper.h
index 1bc0523..b94e949 100644
--- a/src/barchart/qbarmodelmapper.h
+++ b/src/barchart/qbarmodelmapper.h
@@ -35,10 +35,10 @@ class QChart;
 class QTCOMMERCIALCHART_EXPORT QBarModelMapper : public QObject
 {
     Q_OBJECT
-    Q_PROPERTY(QBarSeries *series READ series WRITE setSeries)
-    Q_PROPERTY(QAbstractItemModel *model READ model WRITE setModel)
-    Q_PROPERTY(int first READ first WRITE setFirst)
-    Q_PROPERTY(int count READ count WRITE setCount)
+    Q_PROPERTY(QBarSeries *series READ series WRITE setSeries NOTIFY seriesReplaced)
+    Q_PROPERTY(QAbstractItemModel *model READ model WRITE setModel NOTIFY modelReplaced)
+    Q_PROPERTY(int first READ first WRITE setFirst NOTIFY firstChanged)
+    Q_PROPERTY(int count READ count WRITE setCount NOTIFY countChanged)
     Q_ENUMS(Qt::Orientation)
 
 protected:
@@ -69,6 +69,12 @@ protected:
     Qt::Orientation orientation() const;
     void setOrientation(Qt::Orientation orientation);    
 
+Q_SIGNALS:
+    void seriesReplaced();
+    void modelReplaced();
+    void firstChanged();
+    void countChanged();
+
 protected:
     QBarModelMapperPrivate * const d_ptr;
     Q_DECLARE_PRIVATE(QBarModelMapper)
diff --git a/src/barchart/qhbarmodelmapper.cpp b/src/barchart/qhbarmodelmapper.cpp
index ee10113..c6ebadd 100644
--- a/src/barchart/qhbarmodelmapper.cpp
+++ b/src/barchart/qhbarmodelmapper.cpp
@@ -50,6 +50,18 @@ QTCOMMERCIALCHART_BEGIN_NAMESPACE
 */
 
 /*!
+    \fn void QHBarModelMapper::firstBarSetRowChanged()
+
+    Emitted when the firstBarSetRow has changed.
+*/
+
+/*!
+    \fn void QHBarModelMapper::lastBarSetRowChanged()
+
+    Emitted when the lastBarSetRow has changed.
+*/
+
+/*!
     Constructs a mapper object which is a child of \a parent.
 */
 QHBarModelMapper::QHBarModelMapper(QObject *parent) :
@@ -65,7 +77,10 @@ int QHBarModelMapper::firstBarSetRow() const
 
 void QHBarModelMapper::setFirstBarSetRow(int firstBarSetRow)
 {
-    return QBarModelMapper::setFirstBarSetSection(firstBarSetRow);
+    if (firstBarSetRow != firstBarSetSection()) {
+        return QBarModelMapper::setFirstBarSetSection(firstBarSetRow);
+        emit firstBarSetRowChanged();
+    }
 }
 
 int QHBarModelMapper::lastBarSetRow() const
@@ -75,7 +90,10 @@ int QHBarModelMapper::lastBarSetRow() const
 
 void QHBarModelMapper::setLastBarSetRow(int lastBarSetRow)
 {
-    return QBarModelMapper::setLastBarSetSection(lastBarSetRow);
+    if (lastBarSetRow != lastBarSetSection()) {
+        return QBarModelMapper::setLastBarSetSection(lastBarSetRow);
+        emit lastBarSetRowChanged();
+    }
 }
 
 #include "moc_qhbarmodelmapper.cpp"
diff --git a/src/barchart/qhbarmodelmapper.h b/src/barchart/qhbarmodelmapper.h
index d977a4c..b4469df 100644
--- a/src/barchart/qhbarmodelmapper.h
+++ b/src/barchart/qhbarmodelmapper.h
@@ -28,8 +28,8 @@ QTCOMMERCIALCHART_BEGIN_NAMESPACE
 class QTCOMMERCIALCHART_EXPORT QHBarModelMapper : public QBarModelMapper
 {
     Q_OBJECT
-    Q_PROPERTY(int firstBarSetRow READ firstBarSetRow WRITE setFirstBarSetRow)
-    Q_PROPERTY(int lastBarSetRow READ lastBarSetRow WRITE setLastBarSetRow)
+    Q_PROPERTY(int firstBarSetRow READ firstBarSetRow WRITE setFirstBarSetRow NOTIFY firstBarSetRowChanged)
+    Q_PROPERTY(int lastBarSetRow READ lastBarSetRow WRITE setLastBarSetRow NOTIFY lastBarSetRowChanged)
 
 public:
     explicit QHBarModelMapper(QObject *parent = 0);
@@ -39,6 +39,10 @@ public:
 
     int lastBarSetRow() const;
     void setLastBarSetRow(int lastBarSetRow);
+
+Q_SIGNALS:
+    void firstBarSetRowChanged();
+    void lastBarSetRowChanged();
 };
 
 QTCOMMERCIALCHART_END_NAMESPACE
diff --git a/src/barchart/qvbarmodelmapper.cpp b/src/barchart/qvbarmodelmapper.cpp
index 10dfdd7..4e13122 100644
--- a/src/barchart/qvbarmodelmapper.cpp
+++ b/src/barchart/qvbarmodelmapper.cpp
@@ -50,6 +50,18 @@ QTCOMMERCIALCHART_BEGIN_NAMESPACE
 */
 
 /*!
+    \fn void QVBarModelMapper::firstBarSetColumnChanged()
+
+    Emitted when the firstBarSetColumn has changed.
+*/
+
+/*!
+    \fn void QVBarModelMapper::lastBarSetColumnChanged()
+
+    Emitted when the lastBarSetColumn has changed.
+*/
+
+/*!
     Constructs a mapper object which is a child of \a parent.
 */
 QVBarModelMapper::QVBarModelMapper(QObject *parent) :
@@ -65,7 +77,10 @@ int QVBarModelMapper::firstBarSetColumn() const
 
 void QVBarModelMapper::setFirstBarSetColumn(int firstBarSetColumn)
 {
-    return QBarModelMapper::setFirstBarSetSection(firstBarSetColumn);
+    if (firstBarSetColumn != firstBarSetSection()) {
+        return QBarModelMapper::setFirstBarSetSection(firstBarSetColumn);
+        emit firstBarSetColumnChanged();
+    }
 }
 
 int QVBarModelMapper::lastBarSetColumn() const
@@ -75,7 +90,10 @@ int QVBarModelMapper::lastBarSetColumn() const
 
 void QVBarModelMapper::setLastBarSetColumn(int lastBarSetColumn)
 {
-    return QBarModelMapper::setLastBarSetSection(lastBarSetColumn);
+    if (lastBarSetColumn != lastBarSetSection()) {
+        return QBarModelMapper::setLastBarSetSection(lastBarSetColumn);
+        emit lastBarSetColumnChanged();
+    }
 }
 
 #include "moc_qvbarmodelmapper.cpp"
diff --git a/src/barchart/qvbarmodelmapper.h b/src/barchart/qvbarmodelmapper.h
index 1dbad4f..ae927da 100644
--- a/src/barchart/qvbarmodelmapper.h
+++ b/src/barchart/qvbarmodelmapper.h
@@ -28,8 +28,8 @@ QTCOMMERCIALCHART_BEGIN_NAMESPACE
 class QTCOMMERCIALCHART_EXPORT QVBarModelMapper : public QBarModelMapper
 {
     Q_OBJECT
-    Q_PROPERTY(int firstBarSetColumn READ firstBarSetColumn WRITE setFirstBarSetColumn)
-    Q_PROPERTY(int lastBarSetColumn READ lastBarSetColumn WRITE setLastBarSetColumn)
+    Q_PROPERTY(int firstBarSetColumn READ firstBarSetColumn WRITE setFirstBarSetColumn NOTIFY firstBarSetColumnChanged)
+    Q_PROPERTY(int lastBarSetColumn READ lastBarSetColumn WRITE setLastBarSetColumn NOTIFY lastBarSetColumnChanged)
 
 public:
     explicit QVBarModelMapper(QObject *parent = 0);
@@ -39,6 +39,10 @@ public:
 
     int lastBarSetColumn() const;
     void setLastBarSetColumn(int lastBarSetColumn);
+
+Q_SIGNALS:
+    void firstBarSetColumnChanged();
+    void lastBarSetColumnChanged();
 };
 
 QTCOMMERCIALCHART_END_NAMESPACE