Specifies the spell checking component to be used with a TextControl. The property value is null, if there is no spell checking component connected. Otherwise it must be an object of the type TXSpellChecker. When a spell checking component is connected and the IsSpellCheckingEnabled property has been set to true, misspelled words are automatically underlined with a red zigzag line. The SpellCheckDialog method can be used to correct the misspelled words contained in the document. When a spell checking component is connected and the IsHyphenationEnabled property has been set to true, a document is automatically hyphenated. If the IsLanguageDetectionEnabled property has been set to true, a language is automatically detected for all text parts with a neutral language.