Sticks on plot not working

[giusepped]

I would like to plot vertical stick on my graph.
I tried according to the documentation:


plotEnergy = new QwtPlotCurve();
plotEnergy->attach(this);
plotEnergy->setStyle(QwtPlotCurve::Sticks);
plotEnergy->setBaseline(0);
plotEnergy->setPen(QPen(Qt::black));
plotEnergy->setBrush(QBrush(Qt::Dense7Pattern));

But nothing: the plot still is plotted with lines :confused: