JFreeChart Help: Creating a Gradient Background for a CategoryPlot

I need a Gradient Background for my CategoryPlot Object and am having problems figuring out the best approach.
Does anyone have any suggestions on the best way to approach this problem?
Any help would be appreciated.

        BarRenderer barrenderer = (BarRenderer)categoryplot.getRenderer();
        barrenderer.setDrawBarOutline(false);
        GradientPaint gradientpaint = new GradientPaint(0.0F, 0.0F, Color.blue, 0.0F, 0.0F, new Color(0, 0, 64));
        GradientPaint gradientpaint1 = new GradientPaint(0.0F, 0.0F, Color.green, 0.0F, 0.0F, new Color(0, 64, 0));
        barrenderer.setSeriesPaint(0, gradientpaint);
        barrenderer.setSeriesPaint(1, gradientpaint1);

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JFreeChart Help: Creating a Gradient Background for a CategoryPlot

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