Using qwt designer plugin - oscilloscope example.

Hi,
I have a problem with oscilloscope example. I try to modify it by using qwt designer plugin.
Originally class Plot inherits from QwtPlot and is created in constructor Plot::Plot. When I used designer plugin I have already QwtPlot object created (ui->qwtPlot), so firstly i tried copy contructor but it was wrong way I think.
Then I modified Plot class to store pointer to QwtPlot and changed every usage of inherited methods... problem occurs in timerEvent() and resizeEvent() which are protected:

Quote:

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error: ‘virtual void QObject::timerEvent(QTimerEvent*)’ is protected

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Can't call protected method from pointer...

What is the best way to solve it?

Thanks in advance.