change plot and axis background color

[Cal]

Hi,

i couldnt find any hints on how to change the basic layout of the qwt plot. All i want is to change the axis and plot background to a different color and remove the frame border between the axis and the plot.
as far as i understood it i have to change a QwtPlotPrintFilter object.

i tried it with this in the constructor method of my plot class:

QwtPlotPrintFilter filter;
filter.color(Qt::white,QwtPlotPrintFilter::WidgetBackground );
filter.apply(this);
this->replot();

QwtPlotPrintFilter filter;
filter.color(Qt::white,QwtPlotPrintFilter::WidgetBackground );
filter.apply(this);
this->replot();

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but this doesnt work... maybe someone could help me out here.

thx!
lutz