JFreeChart PolarPlot remove radius labels?

Any ideas? There is no setRadiusLabelsVisible(...) or setLabelGenerator(n开发者_Go百科ull) method which exists for at least some of the other charts. :)

It looks like a PolarPlot has a radial Axis, so

PolarPlot plot = (PolarPlot) chart.getPlot();
ValueAxis axis = plot.getAxis();
axis.setTickLabelsVisible(false);