insert a widget into a group "on-the-fly"

[soul_rebel]

i need to insert objects into a groupbox dynamically, but somehow they dont appear...
i tried this so far:
first:

KURLLabel *label = new KURLLabel(secGroup, "test");
		label->setText("woooha"));

KURLLabel *label = new KURLLabel(secGroup, "test");
		label->setText("woooha"));

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then

KURLLabel *label = new KURLLabel(secGroup, "test");
		QGridLayout *layo = new QGridLayout(secGroup->layout());
		layo->addWidget( label, 0, 0 );
		label->setText("woooha"));

KURLLabel *label = new KURLLabel(secGroup, "test");
		QGridLayout *layo = new QGridLayout(secGroup->layout());
		layo->addWidget( label, 0, 0 );
		label->setText("woooha"));

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the gridlayout actually is there already and has one member before the code is executed...
how would i insert the label, so that it actually is there?
thanks!