QT pushbutton::setdefault() not working

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QT

Hi,

on a QDialog I have a QPushButton. I then use

QPushButton::setDefault( TRUE 
)

so that "the push button will be pressed if the user hits the Enter key in
a dialog". In this scenario it is working.

But in case if i keep QPushButton on QWidget and then set

QPushButton::setDefault( TRUE).

On hitting keyboard enter button nothing happens. Why?

Can someone please answer this and also can suggest me the solution.

Thanks in advance