scrollArea

[franz]

It's probably better to explicitly add your new widget to the scroll area:

QGroupBox *b = new QGroupBox;
b->resize(100,600);
mainWindow->scrollArea->setWidget(b);

QGroupBox *b = new QGroupBox;
b->resize(100,600);
mainWindow->scrollArea->setWidget(b);

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It is probably bad style (read about encapsulation) to have member variables publicly (or even protected) available. Also, please use code tags on the forum when posting code.