Legend Checked from start

Hello,
I will continue looking, but I am trying to find a way to start a "checkable" legend to all checked on startup. Basically I want the QtPlotCurves all visible at startup with the check's in the ON state. Then the user can check them off.

I was hoping for something like legend->setChecked(bool tf), that I could call from implementation, but open to any suggestions... I would like to stay away from default showing none and making the user click them all on, but it is one method... :)
Here is the connect statement I am using for after the legend is first checked...

Code:

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connect(this,SIGNAL(legendChecked(QwtPlotItem*,bool)), this, SLOT(handleLegendChecked(QwtPlotItem*, bool)));

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and the slot it calls...

Code:

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void dataPlot::handleLegendChecked(QwtPlotItem* item, bool tf)
{
    item->setVisible(tf);
    replot();
    if(cStart->isVisible()){curvesLoaded.start = true;} else {curvesLoaded.start = false;}
    if(cRun->isVisible()){curvesLoaded.run = true;} else {curvesLoaded.run = false;}
    if(cCmdwn->isVisible()){curvesLoaded.comedown=true;} else {curvesLoaded.comedown = false;}
    qDebug()<<curvesLoaded.start<<curvesLoaded.run<<curvesLoaded.comedown;
}

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Thanks to any who can help!
AlphaWolfXV

here is how I achieve this:

Code:

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QwtLegendItem* label = (QwtLegendItem*)YourLegend.find(&YourPlotItem);
label->setItemMode(QwtLegend::CheckableItem);
label->setChecked(true);

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I get this error:

Code:

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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:

Code:

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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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