QWidget on WidgetStack

[mickey]

HI,
i have designed a WidgetStack (with qtDesigner) with two page and I assinged them a name: page1 and page2 (this pages are QWidget, from desinger 'object explorer' I see this) .
I'd like to do this:
[code]

QHBoxLayout *l = new QHBoxLayout(this->Page1);		
l->addWidget(myWidget3,0,0);
this->WidgetStack->raiseWidget(Page1);

QHBoxLayout *l = new QHBoxLayout(this->Page1);		
l->addWidget(myWidget3,0,0);
this->WidgetStack->raiseWidget(Page1);

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This don't work and MultipleView appear blank and mywidget3 appear in a small square on toolbar! Page2 is visible but I have insert on it a mywidget from designer...
Why this?

This below works but I'd like make different...

WidgetStack->raiseWidget( myWidget3 );

WidgetStack->raiseWidget( myWidget3 );

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Thanks