diff --git a/src/barchart/barchartitem.cpp b/src/barchart/barchartitem.cpp
index 919171e..b73da7b 100644
--- a/src/barchart/barchartitem.cpp
+++ b/src/barchart/barchartitem.cpp
@@ -41,7 +41,7 @@ BarChartItem::BarChartItem(QBarSeries *series, ChartPresenter *presenter) :
 {
     connect(series, SIGNAL(showToolTip(QPoint,QString)), this, SLOT(showToolTip(QPoint,QString)));
     connect(series, SIGNAL(updatedBars()), this, SLOT(handleLayoutChanged()));
-    connect(series, SIGNAL(restructuredBar(int)), this, SLOT(handleModelChanged(int)));
+    connect(series, SIGNAL(restructuredBars()), this, SLOT(handleModelChanged()));
     setZValue(ChartPresenter::BarSeriesZValue);
     dataChanged();
 }
@@ -112,28 +112,22 @@ QVector<QRectF> BarChartItem::calculateLayout()
 {
     QVector<QRectF> layout;
 
-    // Use temporary qreals for accurancy (we might get some compiler warnings... :)
+    // Use temporary qreals for accurancy
     qreal categoryCount = m_series->categoryCount();
     qreal setCount = m_series->barsetCount();
 
+    // Domain:
     qreal width = geometry().width();
     qreal height = geometry().height();
-
-    qreal max = m_series->max();
-
-    // Domain:
-    if (m_domainMaxY > max) {
-        max = m_domainMaxY;
-    }
-
-    qreal scale = (height / max);
+    qreal range = m_domainMaxY - m_domainMinY;
+    qreal scale = (height / range);
     qreal categoryWidth = width / categoryCount;
     qreal barWidth = categoryWidth / (setCount+1);
 
     int itemIndex(0);
     for (int category = 0; category < categoryCount; category++) {
         qreal xPos = categoryWidth * category + barWidth / 2;
-        qreal yPos = height;
+        qreal yPos = height + scale * m_domainMinY;
         for (int set = 0; set < setCount; set++) {
             QBarSet* barSet = m_series->barsetAt(set);
 
@@ -209,6 +203,7 @@ void BarChartItem::handleDomainChanged(qreal minX, qreal maxX, qreal minY, qreal
 
 void BarChartItem::handleGeometryChanged(const QRectF &rect)
 {
+    prepareGeometryChange();
     m_clipRect = rect.translated(-rect.topLeft());
     m_rect = rect;
     handleLayoutChanged();
@@ -218,6 +213,10 @@ void BarChartItem::handleGeometryChanged(const QRectF &rect)
 
 void BarChartItem::handleLayoutChanged()
 {
+    if ((m_rect.width() <= 0) || (m_rect.height() <= 0)) {
+        // rect size zero.
+        return;
+    }
     QVector<QRectF> layout = calculateLayout();
     applyLayout(layout);
     update();
diff --git a/src/barchart/barchartmodel.cpp b/src/barchart/barchartmodel.cpp
index 9580b65..61f6716 100644
--- a/src/barchart/barchartmodel.cpp
+++ b/src/barchart/barchartmodel.cpp
@@ -152,7 +152,6 @@ qreal BarChartModel::percentageAt(int set, int category) const
     return value / total;
 }
 
-
 qreal BarChartModel::categorySum(int category) const
 {
     qreal sum(0);
@@ -165,6 +164,18 @@ qreal BarChartModel::categorySum(int category) const
     return sum;
 }
 
+qreal BarChartModel::absoluteCategorySum(int category) const
+{
+    qreal sum(0);
+    int count = m_dataModel.count(); // Count sets
+
+    for (int set = 0; set < count; set++) {
+        if (category < m_dataModel.at(set)->count())
+            sum += qAbs(m_dataModel.at(set)->valueAt(category));
+    }
+    return sum;
+}
+
 qreal BarChartModel::maxCategorySum() const
 {
     qreal max = INT_MIN;
diff --git a/src/barchart/barchartmodel_p.h b/src/barchart/barchartmodel_p.h
index 01ae848..c229d78 100644
--- a/src/barchart/barchartmodel_p.h
+++ b/src/barchart/barchartmodel_p.h
@@ -57,6 +57,7 @@ public:
     qreal percentageAt(int set, int category) const;
 
     qreal categorySum(int category) const;
+    qreal absoluteCategorySum(int category) const;
     qreal maxCategorySum() const;     // returns maximum sum of sets in all categories.
 
     QString categoryName(int category);
diff --git a/src/barchart/percentbarchartitem.cpp b/src/barchart/percentbarchartitem.cpp
index fce1356..ad764ec 100644
--- a/src/barchart/percentbarchartitem.cpp
+++ b/src/barchart/percentbarchartitem.cpp
@@ -22,6 +22,7 @@
 #include "bar_p.h"
 #include "barlabel_p.h"
 #include "qbarset.h"
+#include <QDebug>
 
 QTCOMMERCIALCHART_BEGIN_NAMESPACE
 
@@ -43,14 +44,17 @@ QVector<QRectF> PercentBarChartItem::calculateLayout()
     qreal xStep = width / categoryCount;
     qreal xPos =  xStep / 2 - barWidth / 2;
 
+    qreal range = m_domainMaxY - m_domainMinY;
+    qreal domainScale = (height / range);
+
     int itemIndex(0);
     for (int category = 0; category < categoryCount; category++) {
         qreal colSum = m_series->categorySum(category);
-        qreal scale = (height / colSum);
-        qreal yPos = height;
+        qreal percentage = (100 / colSum);
+        qreal yPos = height + domainScale * m_domainMinY;
         for (int set=0; set < m_series->barsetCount(); set++) {
             QBarSet* barSet = m_series->barsetAt(set);
-            qreal barHeight = barSet->valueAt(category) * scale;
+            qreal barHeight = barSet->valueAt(category) * percentage * domainScale;
             Bar* bar = m_bars.at(itemIndex);
             bar->setPen(barSet->pen());
             bar->setBrush(barSet->brush());
diff --git a/src/barchart/qbarseries.cpp b/src/barchart/qbarseries.cpp
index 8ff4614..236dfbe 100644
--- a/src/barchart/qbarseries.cpp
+++ b/src/barchart/qbarseries.cpp
@@ -75,7 +75,7 @@ void QBarSeries::appendBarSet(QBarSet *set)
     m_internalModel->appendBarSet(set);
     connect(set, SIGNAL(clicked(QString,Qt::MouseButtons)), this, SLOT(barsetClicked(QString,Qt::MouseButtons)));
     connect(set, SIGNAL(valueChanged()), this, SLOT(barsetChanged()));
-    emit updatedBars();
+    emit restructuredBars();
 }
 
 /*!
@@ -87,7 +87,36 @@ void QBarSeries::removeBarSet(QBarSet *set)
 {
     disconnect(set, SIGNAL(clicked(QString,Qt::MouseButtons)), this, SLOT(barsetClicked(QString,Qt::MouseButtons)));
     m_internalModel->removeBarSet(set);
-    emit updatedBars();
+    emit restructuredBars();
+}
+
+/*!
+    Adds a list of barsets to series. Takes ownership of \a sets.
+    Connects the clicked(QString, Qt::MouseButtons) signals
+    of \a sets to this series
+*/
+void QBarSeries::appendBarSets(QList<QBarSet* > sets)
+{
+    foreach (QBarSet* barset, sets) {
+        m_internalModel->appendBarSet(barset);
+        connect(barset, SIGNAL(clicked(QString,Qt::MouseButtons)), this, SLOT(barsetClicked(QString,Qt::MouseButtons)));
+        connect(barset, SIGNAL(valueChanged()), this, SLOT(barsetChanged()));
+    }
+    emit restructuredBars();
+}
+
+/*!
+    Removes a list of barsets from series. Releases ownership of \a set. Doesnt delete \a sets.
+    Disconnects the clicked(QString, Qt::MouseButtons) signal
+    of \a sets from this series
+*/
+void QBarSeries::removeBarSets(QList<QBarSet* > sets)
+{
+    foreach (QBarSet* barset, sets) {
+        disconnect(barset, SIGNAL(clicked(QString,Qt::MouseButtons)), this, SLOT(barsetClicked(QString,Qt::MouseButtons)));
+        m_internalModel->removeBarSet(barset);
+    }
+    emit restructuredBars();
 }
 
 void QBarSeries::insertBarSet(int i, QBarSet *set)
@@ -220,6 +249,14 @@ qreal QBarSeries::categorySum(int category)
 }
 
 /*!
+    \internal \a category
+*/
+qreal QBarSeries::absoluteCategorySum(int category)
+{
+    return m_internalModel->absoluteCategorySum(category);
+}
+
+/*!
     \internal
 */
 qreal QBarSeries::maxCategorySum()
@@ -360,7 +397,7 @@ void QBarSeries::modelDataAdded(QModelIndex /*parent*/, int start, int /*end*/)
             barsetAt(i)->insertValue(start - m_mapFirst, m_model->data(m_model->index(i, start), Qt::DisplayRole).toDouble());
         }
     }
-    emit restructuredBar(1);
+    emit restructuredBars();
 }
 
 void QBarSeries::modelDataRemoved(QModelIndex parent, int start, int end)
@@ -373,7 +410,7 @@ void QBarSeries::modelDataRemoved(QModelIndex parent, int start, int end)
     {
         barsetAt(i)->removeValue(start - m_mapFirst);
     }
-    emit restructuredBar(1);
+    emit restructuredBars();
 }
 
 void QBarSeries::barsetChanged()
diff --git a/src/barchart/qbarseries.h b/src/barchart/qbarseries.h
index 2b35535..cf4744a 100644
--- a/src/barchart/qbarseries.h
+++ b/src/barchart/qbarseries.h
@@ -41,8 +41,10 @@ public:
 
     virtual QSeriesType type() const { return QSeries::SeriesTypeBar; }
 
-    void appendBarSet(QBarSet *set);               // Takes ownership of set
+    void appendBarSet(QBarSet *set);            // Takes ownership of set
     void removeBarSet(QBarSet *set);            // Releases ownership, doesn't delete set
+    void appendBarSets(QList<QBarSet* > sets);
+    void removeBarSets(QList<QBarSet* > sets);
     void insertBarSet(int i, QBarSet *set);
     void insertCategory(int i, QString category);
     void removeCategory(int i);
@@ -69,6 +71,7 @@ public:
     qreal valueAt(int set, int category);
     qreal percentageAt(int set, int category);
     qreal categorySum(int category);
+    qreal absoluteCategorySum(int category);
     qreal maxCategorySum();
     BarChartModel& model();
     // <--- TO PIMPL
@@ -78,7 +81,7 @@ Q_SIGNALS:
 
     //
     void updatedBars();
-    void restructuredBar(int);
+    void restructuredBars();
 
     // TODO: internal signals, these to private implementation.
     // TODO: TO PIMPL --->