Nimbus Look and Feel: How do I change the background color of a disabled JSpinner?

Question

I am using Swing with the Look And Feel Nimbus. I've changed the default colors, with code like this:

    UIManager.put("nimbusBase", BLUE);
    UIManager.put("inactiveCaption", GRAY);
    ...

The problem, is that a disabled JSpinner doesn't use gray for it's background (like all the other components), but blue instead:

If I change the "nimbusBase", then my scrollbars etc aren't blue any more. How do I set a disabled JSpinner's background to gray?

Note: Adding this doesn't change anything:

    UIManager.put("Spinner.disabled", GRAY);