How to access canvas and eventFilter() for QwtPlot Spectrogram? [SOLVED]

I'm trying to override the mouse buttons and mouse-wheel to provide *specific*, custom functionality.

For a QwtPlot, I was overriding the eventFilter() and checking for QEvent::Wheel, and then implementing a custom zoom.

The issue is, QwtPlotSpectrogram doesn't have a this->canvas() from which to grab the events, nor a this->invTransform() to implement some of the functionality I was using in a plain QwtPlot.

The functionality I want to implement (accessed via eventFilter()) can be seen here in this thread: http://www.qtcentre.org/threads/5463...-zoom-(How-To)

Is there a way to access the canvas() and invTransform() features from inside of a QwtPlotSpectrogram?

TIA

Edit: Nevermind!!! I figured it out. I just derive from QwtPlot and create the QwtPlotSpectrum inside a QwtPlot. Simple really.