Dear Friends,
I have prepared Two classes, First class is TestView class, Which is derived from QGraphicView Item, The other class is GraphicsViewManager Which is responsible for managing Items moving, painting , adding to Scene and replacing.

I am sending Item list to the GraphicsViewManager, then I am creating std::vector type in GraphicsViewManager then returning it to the Testview and TestView adding it to the Scene, but I couldnt see them on scene.

Qt Code: 
  1. class GraphicsViewManager : public QObject {
  2. 	Q_OBJECT
  3. public:
  4. 	GraphicsViewManager();
  5. 	virtual ~GraphicsViewManager();
  6. 	std::vector <GraphicItem*> LoadList(std::list <Item> Liste);
  7. 	GraphicItem *item;
  8. private:
  9. 	std::vector <GraphicItem*> GItems;
  10. 	std::vector <GraphicItem*>::iterator Itr;
  11. };
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Qt Code: 
  1. void TestView::SetList(std::list <Item> Liste)
  2. {
  3.     _Liste = Liste;
  4.     Items = Manager->LoadList(_Liste); //GraphicsViewManager *Manager;
  5.     for(int i=0;i<Items.size();i++)
  6. 		m_GraphicsScene->addItem(Items[i]);
  7. }
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Qt Code: 
  1. std::vector <GraphicItem*> GraphicsViewManager::LoadList(std::list <Item> Liste)
  2. {
  3. 	GItems.clear();
  4.  
  5. 	for(std::list<Item>::iterator itr=Liste.begin();itr != Liste.end();itr++)
  6. 	{
  7. 		QPixmap pixmap(QString().fromUtf8((char*)itr->PicturesUrl.front().data()));
  8. 		item = new GraphicItem(pixmap);
  9. 		GItems.push_back(item);
  10. 	}
  11. 	SetXYData();
  12. 	return GItems;
  13. }
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When I checked the size of Items , size is true but when I added on Scene it doesnt appear.