layout in widget give me an empty window!

[rimie23]

Hi,
i have Splitter and i make like that

QVBoxLayout *mVerticalLayout;
 QSplitter *Splitter = new QSplitter(this);
         Splitter->setOrientation(Qt::Vertical);
         mVerticalLayout->addWidget(Splitter);
 
         QRenderWindow *orw = new QRenderWindow(Splitter);
         mQRenderWindowList.append(orw);
         Splitter->addWidget(orw);

QVBoxLayout *mVerticalLayout;
 QSplitter *Splitter = new QSplitter(this);
         Splitter->setOrientation(Qt::Vertical);
         mVerticalLayout->addWidget(Splitter);

         QRenderWindow *orw = new QRenderWindow(Splitter);
         mQRenderWindowList.append(orw);
         Splitter->addWidget(orw);

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and that work very good
But i want now add name of each Splitter( i want to see the name) for that i change the method and i use qgroubbox
But that does not work
i make like that

QHBoxLayout *mVerticalLayout;
 QWidget *central = new QGroupBox("My Scene", this);
 
 
		QOgreRenderWindow *orw = new QOgreRenderWindow(central);
 
		mVerticalLayout->addWidget(orw);
		central->setLayout(mVerticalLayout);

QHBoxLayout *mVerticalLayout;
 QWidget *central = new QGroupBox("My Scene", this);
		 
		 
		QOgreRenderWindow *orw = new QOgreRenderWindow(central);
		
		mVerticalLayout->addWidget(orw);
		central->setLayout(mVerticalLayout);

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But that make to me an empty window