Specifies the spell checking component to be used with a ServerTextControl. The property value is null if there is no spell checking component connected. Otherwise it must be an object of the type TXSpell. When a spell checking component is connected and the IsSpellCheckingEnabled property has been set to true, the MisspelledWords collection is automatically filled with all misspelled words contained in the current 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.