QGroupBox expands to maximum in BoxLayout

[olidem]

Hi!

I have added a QGoupBox to my QVBoxLayout.
The QGroupBox itself also holds a QVBoxLayout.

QVBoxLayout * outer = new QVBoxLayout;
outer->addWidget(new QPushButton("A"));
outer->addWidget(new QPushButton("B"));
 
QGroupBox * box = new QGroupBox("title");
QVBoxLayout * inner = new QVBoxLayout;
inner->addWidget(new QRadioButton("Poss A"));
inner->addWidget(new QRadioButton("Poss B"));
box->setLayout(inner);
box->setSizePolicy(QSizePolicy::Minimum,QSizePolicy::Minimum); //doesn't help :-(
outer->addWidget(box);
 
outer->addWidget(new QPushButton("C"));
outer->addWidget(new QPushButton("D"));

QVBoxLayout * outer = new QVBoxLayout;
outer->addWidget(new QPushButton("A"));
outer->addWidget(new QPushButton("B"));

QGroupBox * box = new QGroupBox("title");
QVBoxLayout * inner = new QVBoxLayout;
inner->addWidget(new QRadioButton("Poss A"));
inner->addWidget(new QRadioButton("Poss B"));
box->setLayout(inner);
box->setSizePolicy(QSizePolicy::Minimum,QSizePolicy::Minimum); //doesn't help :-(
outer->addWidget(box);

outer->addWidget(new QPushButton("C"));
outer->addWidget(new QPushButton("D"));

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In this example, the QPushButtons automatically have "unit" height, but are horizontally expanded to maximum width.

The GroupBox also expands to maximal height, which I do not want.

So, my concern is to find a way, s.t. the group box only takes as much space as it really needs to display its contents, i.e. the two QRadioButtons.

Thank you for your help in advance,
Best regards,
Oliver