WizardDescriptor.AsynchronousValidatingPanel should have a method complimentary to its prepareValidation() method.
The proposed finishValidation() will be called from EDT when the background validation is finished (with or without success) and API clients can use this method to enable wizard control locked during the validation.
Created attachment 133411 [details]
Since there are no comments I'll integrate the changes tomorrow.
Integrated into 'main-golden', will be available in build *201304272301* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress)
User: S. Aubrecht <email@example.com>
Log: #228411 - ExtendedAsynchronousValidatingPanel