If you have main window, right click on form and choose addToolBar If you have dialog, then the toolbar will be made manually in code. Also, what do you mean with TabBar ? If it's dock widget, in containers panel you'' fin Dock Widget
TabBar is not an available component in designer. You can create a TabWidget there however which contains one. To add a tool bar, you will need a QMainWindow. So create a new QMainWindow form, right click on it and select "add toolbar".