In widget:
  1. ...
  2. void setup()
  3. {
  4. button->setFocus();
  5. }
  6. ...



in QMainWindow
  1. ...
  2. widget->setup();
  3. setCentralWidget(widget);
  4. ...


but focus are not on button, only if I press tab..
How can I do that focus will be on button?