How do I make tab control take over entire window in Qt Creator?

I want a tab control to "dock" to the entire window panel, in Qt Creator. Now in Winforms and WPF this is super easy but in Qt its not work开发者_如何学运维ing.

I've tried all the layouts, grid layouts, etc etc. it's just shrinking the tabs not making them grow to fill. So please test a solution before telling me what the SHOULD BE OBVIOUS answer is cause its not working.

omg QQ this is driving me NUTS

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I'm unsure what you are trying to achieve here - do you want the control to fill the client area? Are you creating a QMainWindow-derived class or a QDialog-derived one? If using QMainWindow then you'd make the tab control the central widget by calling setCentralWidget. The tab control will then fill the main window's client area. I have done this many times.

Or do you want the tab 'ears' to stretch?