my full cocstructor looks like this
Qt Code: 
  1. FrameInfo::FrameInfo(QWidget* parent )
  2.         :QGroupBox(parent)
  3. {
  4.     //ctor
  5.     frame = new QFrame (this);
  6.     scroll = new QScrollArea(this);
  7.     scroll->setWidget(frame);
  8.  
  9.     mainLayout = new QVBoxLayout(this);
  10.     frame->setLayout(mainLayout);
  11.     mainLayout->addStretch();
  12.  
  13.     QVBoxLayout * topLayout = new QVBoxLayout (this);
  14.     topLayout->addWidget(frame);
  15.  
  16.     setLayout(topLayout);
  17. }
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