Good day everyone

I am struggling to implement a mouseDoubleClickEvent on a QGraphicsRectItems initialized in another class. I have a class called GatewayWidget where i have created the QgraphicsRectItems in a scene using myshape class, but i cannot get the mousedDoubleClickEvent to click on a QgraphicsRectItem on a scene. When i insert a breakpoint at(scene->items()) no items are returned, but the same mouseDoubleClickEvent works when I call a widget(named logWidg) on a doubleclicking of the same QGraphicsRectItem. However when I call on the QGraphicsRectItem to change colour on doubleclick it does not work. please help! I appreciate it advance! please see my code below

Qt Code: 
  1. void GatewayWidget::receivedTitlesEx(const QString &_rStrDescription, const CORE::Time &_rSimTime, const QList<std::shared_ptr<DM::Object> > &_rTitles, int _eType)
  2.                 {  // I add my QGraphicsRectItems on the scene here
  3.                       myshape* shape1 = new myshape(text);
  4. 					 //shape1->setFlag(QGraphicsItem::ItemIsMovable);
  5. 					 shape1->setPos(0, 25);
  6. 					 scene->addItem(shape1);
  7. 					 shape1->setFlag(QGraphicsItem::ItemIsMovable);
  8. 					 shape1->setFlag(QGraphicsItem::ItemIsSelectable);
  9. 					 shape1->setFlag(QGraphicsItem::ItemIsFocusable);
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}
Qt Code: 
  1. void myshape::mouseDoubleClick(QGraphicsSceneMouseEvent *event)
  2. {
  3.  
  4. 	QGraphicsItem::mousePressEvent(event);
  5.  
  6. 	GatewayWidget gw; //this is the class that this method is implemented, and also where i have initialized the scene and drawn qgraphicsitems
  7.          gw.on_btnSelectItem_clicked(); //on_btnSelectItem_Clicked is the method implemented on Gatewaywidget that is supposed to change QGraphicsRectItem on double click, but it does not work. please help
  8.  
  9.        //logWidg = new loginWidget();// but this widget can launch successfully when i click on the QGrapicsRectItem
  10. 	//logWidg->show();
  11.  
  12.        QList<QGraphicsItem*> stackOfShapes = gw.scene->items();// I tried to check if gw can return items but the breakpoint i inserted returns zero items
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myshape .h file is as follows:
Qt Code: 
  1. class myshape :public QObject, public QGraphicsRectItem{
  2.  
  3. public:
  4. 	myshape(QGraphicsItem *item) {
  5. 		setPen(QPen(QBrush(Qt::black), 1));
  6. 		setBrush(QBrush(Qt::green));
  7. 		setRect(0, 0, 80, 80);
  8.  
  9. 	}
  10.  
  11. protected:
  12.  
  13. 	void mouseDoubleClickEvent(QGraphicsSceneMouseEvent *event);
  14.  
  15. private:
  16.  
  17. 	GatewayWidget  *gatew; //i have implemented the myshape::mousedoubleclick event on the class(GatewayWidget)
  18.  
  19.  
  20. 	virtual QSizeF sizeHint(Qt::SizeHint which,
  21. 		const QSizeF& constraint = QSizeF()) const {
  22. 		Q_UNUSED(which);
  23. 		Q_UNUSED(constraint);
  24. 		return boundingRect().size();
  25. 	}
  26.  
  27. 	virtual void setGeometry(const QRectF& rect) {
  28.  
  29. 		setPos(rect.center());
  30. 	}
  31.  
  32.  
  33. };
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on_btnSelectItem_clicked() is the method i call that is supposed to change colour of QGraphicsRectItem on mouseDoubleClickEvent but it does not work

Qt Code: 
  1. void GatewayWidget::on_btnSelectItem_clicked()
  2. {
  3.  
  4.          foreach(QGraphicsItem *item, scene->selectedItems())
  5. 	      {
  6.  
  7. 		QGraphicsRectItem *rect = qgraphicsitem_cast<QGraphicsRectItem *>(item);
  8. 		if (!rect)
  9. 			continue;
  10.  
  11. 		QBrush br(Qt::SolidPattern);
  12. 		br.setColor(Qt::black);
  13. 		rect->setBrush(br);
  14. 		rect->update();
  15. 	      }
  16. }
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