Missung method QwtPlot::clear() in Qwt 6.0.1

I recently updated my Qwt version from 5.2.1 to 6.0.1 and am now missing the QwtPlot::clear() method to clear all attached plots.
Also i could not find another method that would serve as replacement for this. I am grateful for help !
(I am using Qt 4.6.2 on Ubuntu Linux 10.04 with QtCreator)

Code:

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plot->detachItems( QwtPlotItem::Rtti_PlotCurve, ... );
plot->detachItems( QwtPlotItem::Rtti_PlotMarker, ... );

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Uwe

QwtPlotDict::detachItems();