extra line when adding QToolBar into QMainWindow

[cic]

Hi,

How can I avoid this line when adding QToolBar into mainwindow?
seems that there contains 2 tool bar?



QToolBar* toolBar = new QToolBar(this);
toolBar->setGeometry(0,0,200,20);
this->addToolBar(toolBar);


9375

Added after 1 31 minutes:

It seems that when one QMainWindow is created,
there is already one default ToolBar inside of it.



<QToolBar*> bars = this->findChildren<QToolBar*>();


I get one tool bar element without calling addToolBar function...
But somehow I dont find similar functions like QMainWindow::menuBar() or QMainWindow::statusBar()...