addWidget in qWidgetStack

[mickey]

Hi,
I need to add a widget on a widgetstack (and work!) but I need it is 1/2 of widgetStack (insert from Designer)

MyWidget top (&w, "top");	
top.setGeometry(QRect(0,0,w.WidgetStack->width()/2,w.WidgetStack->height()) );
int shared_top= w.WidgetStack->addWidget(&top);
cout << w.WidgetStack->width() << endl;
cout << w.WidgetStack->height() << endl;

MyWidget top (&w, "top");	
top.setGeometry(QRect(0,0,w.WidgetStack->width()/2,w.WidgetStack->height()) );
int shared_top= w.WidgetStack->addWidget(&top);
cout << w.WidgetStack->width() << endl;
cout << w.WidgetStack->height() << endl;

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Why doesn't it work? (cout print 101 and 31 (why 31? Should be much more))
Thanks....