How to use WindowBuilder to edit a JPanel in an inner class?

It isn't clear why the JPanel must be an inner class. In general, that is not a good idea (you will end up with multiple . Class files either way).

The JPanel should just be its own top-level class and referenced from your wrapper class (all of which can be in the same jar). WindowBuilder can easily be used to create/edit your JPanel subclasses (including ones originally created with NetBeans), but it will only do so for top-level classes. It won't allow you to create/edit an inner class like this (which is entirely intentional).

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