RapidSpell Silverlight supports plain text boxes, rich text boxes (SL v4) and 3rd party controls. RapidSpell Silverlight includes 2 spelling controls; RapidSpellDialog which has all the usual GUI features, add, undo, options, change, change all, ignore, ignore all, smart suggestions and double word detection. Checks selections, whole documents with wrap at end, and accepts manual corrections and RapidSpellChecker which is the engine in the API, it can be used to spell check strings and can form the basis of a custom user experience. Designed to have a minimal foot-print, uncompressed, the DLL and English dictionary total only 570KB.