Hiding QGraphicsRectItems

[ddze]

I am trying to use hide() show() or setVisible(false) function with QGraphicsRectItem objects. I can display them on the scene but no way I can do anything to hide them from screen. I have initialised them in the following code :

rectItems = new QVector<QGraphicsRectItem *>();
 
for (int raw=0;raw<this->qElementsHeight;raw++){
		for(int column=0;column<this->qElementsWidth;column++){
			QRectF rectF( raw*48, column*48, 48, 48 );
			QGraphicsRectItem *rect = new QGraphicsRectItem(rectF);
			rect->setPen(pen);
			rectItems->push_back(rect);
			rectItems->last()->setVisible(false);
			this->addRect(rectItems->last()->rect(),pen);
		}
	}

rectItems = new QVector<QGraphicsRectItem *>();

for (int raw=0;raw<this->qElementsHeight;raw++){
		for(int column=0;column<this->qElementsWidth;column++){
			QRectF rectF( raw*48, column*48, 48, 48 );
			QGraphicsRectItem *rect = new QGraphicsRectItem(rectF);
			rect->setPen(pen);
			rectItems->push_back(rect);
			rectItems->last()->setVisible(false);
			this->addRect(rectItems->last()->rect(),pen);
		}
	}

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then tried to use hide() in a slot function:

for (int c=0;c<rectItems->count();c++){
		QGraphicsRectItem *temp =rectItems->at(c);
		if(bGrid) {
			//temp->setVisible(true);
			//temp->show();
			rectItems[0].at(c)->setVisible(true);
		}
		else {
			//temp->setVisible(false);
			//temp->hide();
			rectItems[0].at(c)->setVisible(false);
		}
	}

for (int c=0;c<rectItems->count();c++){
		QGraphicsRectItem *temp =rectItems->at(c);
		if(bGrid) {
			//temp->setVisible(true);
			//temp->show();
			rectItems[0].at(c)->setVisible(true);
		}
		else {
			//temp->setVisible(false);
			//temp->hide();
			rectItems[0].at(c)->setVisible(false);
		}
	}

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none of it hides the rectangles in the scene. Is there a way of hiding them ?