remove of all QwtPlotCurves

[Uwe]

void MainWindow::enableZoomMode(bool on)
{
        ...
        if ( on ) {
             dataZoomer[0]->setEnabled(on)
             dataZoomer[0]->setZoomBase();
        }
        else {
            dataZoomer[0]->zoom(0); // zoom out
            dataZoomer[0]->setEnabled(on);
        }
        ...
}

void MainWindow::enableZoomMode(bool on)
{
        ...
        if ( on ) {
             dataZoomer[0]->setEnabled(on)
             dataZoomer[0]->setZoomBase();
        }
        else {
            dataZoomer[0]->zoom(0); // zoom out
            dataZoomer[0]->setEnabled(on);
        }
        ...
}

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Uwe