Tooltips for invisible shapes?

[converge]

I'm using an XYLineAndShapeRenderer with shapes set to "hidden". My problem is that the tooltips are not being displayed when the mouse is hovering over these "hidden" shapes. If I set the shapes to visible in the renderer constructor, then the tooltips are correctly displayed when the mouse hovers over the (now visible) shapes. Here is my code:

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final XYLineAndShapeRenderer renderer = new XYLineAndShapeRenderer(true, false);
renderer.setBaseToolTipGenerator(new StandardXYToolTipGenerator());
renderer.setSeriesShape(1, new Rectangle(0, 0, 1, 500));

Is there a way to force the tooltips to be displayed when hovering over hidden shapes?

[david.gilbert]

Do you see a tooltip if you hover really close to the actual data point? The item shape no longer applies, because it is never drawn, but a default tooltip hotspot should still get created. You can increase the area of the default tooltip area by calling setDefaultEntityRadius(int) in the renderer.