python.noob 0 Light Poster

Hello all,
One simple question.. We can set Tab bar for the tab widget in pyqt...
I want to place a push button on tab1.. In what way i can do that??? Should i have to add this in the first tab in tab bar or in the tab widget directly.. If i'm not clear, in QTabWidget we will add the components in this sequence
CreateWidget-->Add it to the tab(addTab)--->Add it to the QTabWidget..

In the same manner how should i use QTabbar..
CreateWidget--->Add to TabBar--->Add it to the Tab(in Tab Widget)
or
CreateTabBar---->SetTabBar and CreateWidget---->Add to the TabWidget ...
Explain me in detail...