diff --git a/src/barchart/bargroup.cpp b/src/barchart/bargroup.cpp
index fb2e727..9da9083 100644
--- a/src/barchart/bargroup.cpp
+++ b/src/barchart/bargroup.cpp
@@ -32,7 +32,8 @@ void BarGroup::setPlotDomain(const PlotDomain& data)
 
 void BarGroup::setTheme(ChartTheme *theme)
 {
-    // TODO
+    qDebug() << "BarGroup::setTheme";
+    // TODO:
 }
 
 void BarGroup::setBarWidth( int w )
diff --git a/src/barchart/percentbargroup.cpp b/src/barchart/percentbargroup.cpp
index 72ec026..e8ff476 100644
--- a/src/barchart/percentbargroup.cpp
+++ b/src/barchart/percentbargroup.cpp
@@ -30,6 +30,12 @@ void PercentBarGroup::setPlotDomain(const PlotDomain& data)
     // TODO:
 }
 
+void PercentBarGroup::setTheme(ChartTheme *theme)
+{
+    qDebug() << "PercentBarGroup::setTheme";
+    // TODO:
+}
+
 void PercentBarGroup::setBarWidth( int w )
 {
     mBarDefaultWidth = w;
diff --git a/src/barchart/stackedbargroup.cpp b/src/barchart/stackedbargroup.cpp
index 37d5835..e0b74cb 100644
--- a/src/barchart/stackedbargroup.cpp
+++ b/src/barchart/stackedbargroup.cpp
@@ -30,6 +30,12 @@ void StackedBarGroup::setPlotDomain(const PlotDomain& data)
     // TODO:
 }
 
+void StackedBarGroup::setTheme(ChartTheme *theme)
+{
+    qDebug() << "StackedBarGroup::setTheme";
+    // TODO:
+}
+
 void StackedBarGroup::setBarWidth( int w )
 {
     mBarDefaultWidth = w;
diff --git a/src/barchart/stackedbargroup.h b/src/barchart/stackedbargroup.h
index 0c18b1c..2960692 100644
--- a/src/barchart/stackedbargroup.h
+++ b/src/barchart/stackedbargroup.h
@@ -8,6 +8,7 @@
 
 QTCOMMERCIALCHART_BEGIN_NAMESPACE
 
+// TODO: derive this from ChartObjectInterface, when setSize is back in ChartItem
 class StackedBarGroup : public ChartItem
 {
 public:
diff --git a/src/chartitem_p.h b/src/chartitem_p.h
index 18be17f..f33b883 100644
--- a/src/chartitem_p.h
+++ b/src/chartitem_p.h
@@ -6,7 +6,8 @@
 #include <QGraphicsItem>
 
 QTCOMMERCIALCHART_BEGIN_NAMESPACE
-
+// TODO: setSize and set plotDomain back here. Derive this only from QGraphicsItem
+// class ChartItem : public QGraphicsItem
 class ChartItem : public QGraphicsItem, public ChartObjectInterface
 {
     enum ChartItemTypes{ AXIS_ITEM = UserType+1, XYLINE_ITEM};
diff --git a/src/chartobjectinterface_p.h b/src/chartobjectinterface_p.h
index 9d7de86..1946162 100644
--- a/src/chartobjectinterface_p.h
+++ b/src/chartobjectinterface_p.h
@@ -18,6 +18,7 @@ class PlotDomain;
 class ChartObjectInterface
 {
 public:
+// TODO: move setSize and setPlotDomain back to ChartItem. This interface should be only about handling themes.
     virtual void setSize(const QSize &size) = 0;
     virtual void setTheme(ChartTheme *theme) = 0;
     virtual void setPlotDomain(const PlotDomain& data) = 0;
diff --git a/src/qchart.cpp b/src/qchart.cpp
index 57504c0..71cefb7 100644
--- a/src/qchart.cpp
+++ b/src/qchart.cpp
@@ -100,14 +100,14 @@ void QChart::addSeries(QChartSeries* series)
 
         m_chartObjectInterfaces << barGroup;
         childItems().append(barGroup);
-
+/*
         m_plotDataIndex = 0 ;
         m_plotDomainList.resize(1);
 
         PlotDomain& domain = m_plotDomainList[m_plotDataIndex];
         foreach(ChartItem* i ,m_chartItems)
             i->setPlotDomain(m_plotDomainList.at(m_plotDataIndex));
-
+*/
         break;
         }
     case QChartSeries::SeriesTypeStackedBar: {
@@ -125,13 +125,14 @@ void QChart::addSeries(QChartSeries* series)
 
         m_chartObjectInterfaces << stackedBarGroup;
         childItems().append(stackedBarGroup);
+/*
         m_plotDataIndex = 0 ;
         m_plotDomainList.resize(1);
 
         PlotDomain& domain = m_plotDomainList[m_plotDataIndex];
         foreach(ChartItem* i ,m_chartItems)
             i->setPlotDomain(m_plotDomainList.at(m_plotDataIndex));
-
+*/
         break;
         }
     case QChartSeries::SeriesTypePercentBar: {
@@ -149,13 +150,14 @@ void QChart::addSeries(QChartSeries* series)
 
         m_chartObjectInterfaces << percentBarGroup;
         childItems().append(percentBarGroup);
+/*
         m_plotDataIndex = 0 ;
         m_plotDomainList.resize(1);
 
         PlotDomain& domain = m_plotDomainList[m_plotDataIndex];
         foreach(ChartItem* i ,m_chartItems)
             i->setPlotDomain(m_plotDomainList.at(m_plotDataIndex));
-
+*/
         break;
         }
     case QChartSeries::SeriesTypeScatter: {