Ignoring keyboard events in QwtPlotPicker

[frankiefrank]

Sorry if this question was already asked, I couldn't find it searching.

I have the following plot picker initialized for my QwtPlot:

mPicker = new QwtPlotPicker(QwtPlot::xBottom, QwtPlot::yLeft, 
QwtPlotPicker::CrossRubberBand, QwtPlotPicker::AlwaysOff, canvas());
mPicker->setStateMachine(new QwtPickerClickPointMachine());

mPicker = new QwtPlotPicker(QwtPlot::xBottom, QwtPlot::yLeft, 
QwtPlotPicker::CrossRubberBand, QwtPlotPicker::AlwaysOff, canvas());
mPicker->setStateMachine(new QwtPickerClickPointMachine());

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I see that the default behavior is that the keyboard events (mainly the direction keys) are handled by the plot picker to move around the cross. How can I ignore these events so that they are not caught by the plot / picker?