Hint: auto-connection of signals and slots when subclassing dialog widgets

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I just stumbled over it: I have a widget A, which is sort of a container designer widget. It contains some standard elements, and a lot of functionality that is shared across a lot of dialogs I have.

So the obvious solution to me was: subclass A everytime you need a similar dialog and put all the common functionality in A.

To keep the form elements in A, I created an empty "centralWidget" in A. In B's constructor I did:

B::B(QWidget *parent) : A(parent) {
    ui->setupUi(centralWidget);
}

B::B(QWidget *parent) : A(parent) {
    ui->setupUi(centralWidget);
}

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This works fine, but auto-connection doesn't work anymore, i.e. void B::on_button1_clicked() was not called anymore.
Solution:

B::B(QWidget *parent) : A(parent) {
    ui->setupUi(centralWidget);
    QMetaObject::connectSlotsByName(this);
}

B::B(QWidget *parent) : A(parent) {
    ui->setupUi(centralWidget);
    QMetaObject::connectSlotsByName(this);
}

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There you go. I hope I saved someone some time figuring this out.