Remove an item

[giusepped]

I wouldl like to remove an item from the legend of a plot.
I tried

dDailyValues = new QwtPlotCurve("");
....
QwtLegend* legend = new QwtLegend(this);
        legend->remove(dDailyValues);
insertLegend(legend,QwtPlot::BottomLegend);

dDailyValues = new QwtPlotCurve("");
....
QwtLegend* legend = new QwtLegend(this);
        legend->remove(dDailyValues);
insertLegend(legend,QwtPlot::BottomLegend);

To copy to clipboard, switch view to plain text mode 

But I still see the symbols for dDailyValues (a line) in the legend
Why?