Legend Checked from start

[fatecasino]

I get this error:

error: request for member ‘find’ in ‘legend’, which is of non-class type ‘QwtLegend*’

error: request for member ‘find’ in ‘legend’, which is of non-class type ‘QwtLegend*’

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I use your command lines like this:

QwtLegend *legend = new QwtLegend;
    legend->setItemMode( QwtLegend::CheckableItem );
    myPlot->insertLegend(legend, QwtPlot::BottomLegend);
 
    //main Curve
    mainCurve =  new QwtPlotCurve("mainCurve");
    mainCurve->setRenderHint(QwtPlotItem::RenderAntialiased);
    mainCurve->setPen(QPen(Qt::black));
    mainCurve->setLegendAttribute(QwtPlotCurve::LegendShowLine);
    QwtLegendItem* label = (QwtLegendItem*)legend.find(&mainCurve);
    label->setChecked(true);

QwtLegend *legend = new QwtLegend;
    legend->setItemMode( QwtLegend::CheckableItem );
    myPlot->insertLegend(legend, QwtPlot::BottomLegend);

    //main Curve
    mainCurve =  new QwtPlotCurve("mainCurve");
    mainCurve->setRenderHint(QwtPlotItem::RenderAntialiased);
    mainCurve->setPen(QPen(Qt::black));
    mainCurve->setLegendAttribute(QwtPlotCurve::LegendShowLine);
    QwtLegendItem* label = (QwtLegendItem*)legend.find(&mainCurve);
    label->setChecked(true);

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