Qt Code: 
  1. void MainWindow::setGUI()
  2. {
  3.      QWidget* frame = new QWidget;
  4.     QToolButton *toolButton;
  5.     _layout = new QVBoxLayout;
  6.     frame->setLayout(_layout);
  7.      tabWidget = new QTabWidget();
  8.      tab = new QWidget();
  9.      pushButton = new QPushButton(tab);
  10.      tabWidget->addTab(tab, QString());
  11.      _layout->addWidget(tabWidget);
  12.      scrollArea = new QScrollArea;
  13.      scrollArea->setWidget(frame);
  14.      scrollArea->setWidgetResizable(true);
  15.      setCentralWidget(scrollArea);
  16. }
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This above works fine, i got scrollArea->tabWidget->tab->pushButton, but if I'd like to addWidget from other method/function to this layout i am not able to add new widget to "tab". Everything is under tabWidget which is part of scrollArea (centralWidget).
Qt Code: 
  1. void MainWindow::addToGUI()
  2. {
  3.         while(true)
  4.         {
  5.  
  6.                 QGroupBox* newGB = new QGroupBox("group box"); 
  7.                 QFormLayout* form_layout = new QFormLayout;
  8.  
  9.                 layout->addRow("ID1", new QLabel(function()));
  10.                 layout->addRow("ID2", new QLabel(function()));
  11.                 layout->addRow("ID3", new QLabel(function()));
  12.  
  13.                 newGB->setLayout(layout);
  14.                this->_layout->addWidget(newGB); // i want this in tabWidget->tab, i know that there is setCentralWIdget(scrollArea) and that is why i get this under tabWidget.
  15.          }
  16. }
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Here is what i mean -> 84465788e05d.jpg

How to solve this?