Hello to all!

I've been trying for whole day to make following demand work:

I have a QDockWidget on QMainWIndow. In this QDockWIdget I want to have an QGLWidgeet containing some animation and beneath in horiz layout two QPushButtons.

I wrote following code:
Qt Code: 
  1. COperationWIndow::COperationWIndow(QWidget* pParent) : QDockWidget(pParent)
  2. {
  3.     //setAllowedAreas(Qt::LeftDockWidgetArea);    // sets allowed dock area
  4.     setWindowTitle(trUtf8("Izbor ponudbe jedi in pijač"));    // sets window title
  5.  
  6.     // layout creation
  7.     m_pVLayout=new QVBoxLayout(this);    // creates new vertical layout
  8.     Q_CHECK_PTR(m_pVLayout);    // checks creation
  9.     m_pHLayout=new QHBoxLayout(this);    // creates new horizontal layout
  10.     Q_CHECK_PTR(m_pHLayout);    // checks creation
  11.  
  12.     // creates merchandize browser
  13.     m_pMerchandizeBrowser=new CMerchandizeBrowser(this);    // creates new merchandize selector
  14.     //m_pMerchandizeBrowser=new CMerchandizeBrowser(pParent);    // creates new merchandize selector
  15.     Q_CHECK_PTR(m_pMerchandizeBrowser);    // checks creation
  16.     m_pVLayout->addWidget(m_pMerchandizeBrowser);    // adds merchandize selector to vertical layout
  17.  
  18.     // creates Left Selector pushbutton
  19.     m_pLeftButtonMerchandizeSelector=new QPushButton(trUtf8("Izbira levega artikla"), this);
  20.     //m_pLeftButtonMerchandizeSelector=new QPushButton(trUtf8("Izbira levega artikla"), pParent);
  21.     Q_CHECK_PTR(m_pLeftButtonMerchandizeSelector);    // checks creation
  22.  
  23.     // creates Right Selector pushbutton
  24.     m_pRightButtonMerchandizeSelector=new QPushButton(trUtf8("Izbira desnegs artikla"), this);
  25.     //m_pRightButtonMerchandizeSelector=new QPushButton(trUtf8("Izbira desnegs artikla"), pParent);
  26.     Q_CHECK_PTR(m_pRightButtonMerchandizeSelector);    // checks creation
  27.  
  28.     m_pHLayout->addWidget(m_pLeftButtonMerchandizeSelector);    // adds button to horiz. layout
  29.     m_pHLayout->addWidget(m_pRightButtonMerchandizeSelector);    // adds button to horiz. layout
  30.  
  31.     m_pVLayout->addLayout(m_pHLayout);    // add horiz. layout to vertical layout
  32.     setLayout(m_pVLayout);    // sets main layout on widget
  33.     setLayout(m_pHLayout);    // sets main layout on widget
  34.     //setWidget(m_pMerchandizeBrowser);
  35. }
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but this does not work. QGLWidget is not even seen, both qpushbuttons are located in the left upper corner one behind other. What the heck is going on???!!