Problem in setting background image of a custom widget

[Ferdous]

I tried the following code but in vain.

setAutoFillBackground(true);
//QPalette palette = this->palette();
QPalette palette;
palette.setBrush(QPalette::Window, QBrush(QPixmap(":/Resources/topGradient.png")));
this->setPalette(palette);

setAutoFillBackground(true);
//QPalette palette = this->palette();
QPalette palette;
palette.setBrush(QPalette::Window, QBrush(QPixmap(":/Resources/topGradient.png")));
this->setPalette(palette);

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I tried with stylesheet but doing so caused the child widgets (buttons, labels) inherit the background image. So it's not suitable for my need.

setStyleSheet("background-image: url(:/Resources/topGradient.png);");

setStyleSheet("background-image: url(:/Resources/topGradient.png);");

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Can you please tell me why the use of QPalette for setting background image did not work?

Thanks.