cannot change QLCDNumber background color

[saman_artorious]

here is what I do:

final_angle->display(44.4);
        QPalette* palette = new QPalette();
        palette->setColor(QPalette::Background,Qt::red);
        final_angle->setPalette(*palette);

final_angle->display(44.4);
        QPalette* palette = new QPalette();
        palette->setColor(QPalette::Background,Qt::red);
        final_angle->setPalette(*palette);

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where is the problem?