Adding QGroupBox to QTabWidget

[wysota]

You don't have to pass anything there. Just create your tab widget and set it as the central widget. You shouldn't touch setupUi() at all.

MyWindow::MyWindow(QWidget *parent) : QMainWindow(parent){
  ui.setupUi(this);
  QTabWidget *tw = new QTabWidget(this);
  setCentralWidget(tw);
  QGroupBox *gb1 = new QGroupBox(tw);
  tw->addPage(gb1, "first");
  QHBoxLayout *l = new QHBoxLayout(gb1);
  DMXTable *t1 = new DMXTable;
  l->addWidget(t1);
  //...
}

MyWindow::MyWindow(QWidget *parent) : QMainWindow(parent){
  ui.setupUi(this);
  QTabWidget *tw = new QTabWidget(this);
  setCentralWidget(tw);
  QGroupBox *gb1 = new QGroupBox(tw);
  tw->addPage(gb1, "first");
  QHBoxLayout *l = new QHBoxLayout(gb1);
  DMXTable *t1 = new DMXTable;
  l->addWidget(t1);
  //...
}

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