#include <QApplication>
#include <QGroupBox>
#include <QLabel>
#include <QVBoxLayout>
#include <QWidget>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QWidget w;
    QGroupBox *g;
    w.setLayout(new QVBoxLayout);
    w.layout()->addWidget(new QLabel("Label"));
    w.layout()->addWidget(g = new QGroupBox("Group Box"));

    QPalette p = qApp->palette();
    p.setColor(QPalette::Window, Qt::black);
    p.setColor(QPalette::WindowText, Qt::white);
    qApp->setPalette(p);

    // GroupBox title color is black.

    // This line effects a title white.
    //g->setPalette(p);

    w.show();
    return a.exec();
}