qwt setCanvasBackground() won't

[Uwe]

setCanvasBackground() had once been introduced for the designer, where you need to have a property.
But when looking at the implementation you will probably see, what goes wrong - maybe setting another canvas later.

void QwtPlot::setCanvasBackground( const QBrush &brush )
{
    QPalette pal = canvas()->palette();
    pal.setBrush( QPalette::Window, brush );
 
    canvas()->setPalette( pal );
}

void QwtPlot::setCanvasBackground( const QBrush &brush )
{
    QPalette pal = canvas()->palette();
    pal.setBrush( QPalette::Window, brush );

    canvas()->setPalette( pal );
}

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Uwe