I have set up open office NHunspell as described above. I downloaded a medical dictionary .aff and .dic files (en_US_OpenMedSpel) and included them in the App_Data/RadSpell dictionary along with the en_US.aff and en_US.dic files. When I test the spell check with a word found in the medical dictionary, but not in the en_US dictionary, it fails to find the word.
I tried including "en_US_OpenMedSpel" under hte supportedLanguages. That did not work either. Regular spell check is working fine.
Did I miss something on the setup. How do I use multiple languages for a single text box. I tried to just use the medical dictionary and that failded. It was still looking for english. Any assistance would be appreciated.