A question about adding to layout

[Cruz]

I want to add childWidgets to a layouted parentWidget at runtime. I need to construct the children like

ChildWidget* child = new ChildWidget(parentWidget);

ChildWidget* child = new ChildWidget(parentWidget);

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right? So now I would expect the child to be layed out according to the parentWidget's layout, but it doesn't happen. It seems like I explicitely have to:

ChildWidget* child = new ChildWidget(parentWidget);
parentWidget->layout()->addWidget(child);

ChildWidget* child = new ChildWidget(parentWidget);
parentWidget->layout()->addWidget(child);

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Is this the right way? It feels like I'm adding the child to the parent twice.