[PyQt] help with qscrollarea for a stacked widget

[NISA BALAKRISHNAN]

i am new to pyqt.
i have created my gui using Qtdesigner4
now i want to add a  vertical scrollbar to stacked widget which is placed on
a frame.
when i do it as follows the stacked widget forms a new window. i want it in
the existing main window.
self.scrollarea=QtGui.scrollArea()
self.scrollarea.setwidget(self.stackedWidget)
self.scrollarea.show()

any help appretiated.
thanks in advance!
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