[Carbon] Setting a (transparent) pixmap in a brush of a palette for the QWidget::backgroundRole() of a Top level QWidget does not work - empty transparent window.

void Dock::on_lwImages_itemActivated( QListWidgetItem* item )
{
	const QPixmap pixmap( item->data( Qt::UserRole ).toString() );
	QPalette palette = QApplication::palette();
	
	palette.setBrush( widget->backgroundRole(), QBrush( pixmap ) );
	widget->setPalette( palette );
	widget->resize( pixmap.size() );
}