QwtLegend* legend = dynamic_cast<QwtLegend*>( plotCurve->plot()->legend() );
QWidget* widget = legend->legendWidget( itemInfo );
QwtLegendLabel* label = dynamic_cast<QwtLegendLabel*>( widget );
QwtLegend* legend = dynamic_cast<QwtLegend*>( plotCurve->plot()->legend() );
QWidget* widget = legend->legendWidget( itemInfo );
QwtLegendLabel* label = dynamic_cast<QwtLegendLabel*>( widget );