void Foo::componentComplete()
{
    QObjectList children = this->children();

    for (int i = 0; i < children.length(); i++)
    {
        if(QString(children[i]->metaObject()->className()).contains("MyClass"))
        {
            this->myChildList.append(static_cast<MyClass*>(children[i]));
        }
    }
}

ChartView {
    id: chart
    title: "Top-5 car brand shares in Finland"
    anchors.fill: parent
    legend.alignment: Qt.AlignBottom
    antialiasing: true

    PieSeries {
        id: pieSeries
        PieSlice { label: "Volkswagen"; value: 13.5 }
        PieSlice { label: "Toyota"; value: 10.9 }
        PieSlice { label: "Ford"; value: 8.6 }
        PieSlice { label: "Skoda"; value: 8.2 }
        PieSlice { label: "Volvo"; value: 6.8 }
    }
}