How to make QWidgets overlapping?

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Hi all. Sorry about my weak english, (please check my grammatical errors).
The subject is:
There is a parent QWidget which contains two child widgets called A and B.
How I can make widget A to overlap B (partially, not completely)?

dangelog

Just set the children widgets geometries explicitely :)

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thanks, but it is not suitable. Child widgets A and B may be QDockWidget or QMdiSubWindow instanses.

dangelog

I'm not sure why then you want such a thing -- anyway, QDockWidget geometries are managed by the QMainWindow inner layouting system. QMdiSubWindows geometries should instead be manageable by you.

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In fact i want to create a special menubar for my QMainWindow instance.
Menubar should be shown when mouse moving on his header and should be hidden when mouse cursor leaves it. I cannot use hide() method of the internal QMenuBar widget, because other widgets automatically are moved above. I want other widgets to be at the same place.