QtGui. How to catch event then controls added to widget (wgt is container!)

Hi to all!

I have a main widget (container, inherited from QWidget) and I need to initialize child contorls by parent params then it added (dropped) to main widget.

I heed signal or event, because control loaded from ui files by QFromBuilder/QUiLoader.

Then control added to main wiget it must be called childControl->setupControls(...);

Thanks!

What is the question/problem?