How to access QwtPlotMarkers out of the itemList()?

[freeman_w]

Hi there!

I am trying to make some markers of a plot disappear. I am using the itemList() function to get the plotitems:

foreach (QwtPlotItem* item, itemList())
    {
        if (item->rtti() == QwtPlotItem::Rtti_PlotMarker)
        {
                //if (item->lineStyle() == QwtPlotMarker::NoLine) // doesn't work because item is of type QwtPlotItem and not QwtPlotMarker
                item->setVisible(false);
        }
    }

foreach (QwtPlotItem* item, itemList())
    {
        if (item->rtti() == QwtPlotItem::Rtti_PlotMarker)
        {
                //if (item->lineStyle() == QwtPlotMarker::NoLine) // doesn't work because item is of type QwtPlotItem and not QwtPlotMarker
                item->setVisible(false);
        }
    }

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I need to leave some line-markers visible and hide the "QwtPlotMarker::NoLine"-ones.
How do i access the QwtPlotMarker out of the "QwtPlotItem* item"??
Is there a way to achieve that?

Thanks in advance...