Keyoti, vendor of the spell checking software RapidSpell, has published a very extensive article on how to implement spell checking and thesaurus into TX Text Control. The article shows you how to include professional spell checking including the special handling of text frames, headers and footers, complex context menus and as-you-type or dialog interaction.

Please read the full article at:

RapidSpell Desktop and Thesaurus Desktop Integration With TX Text Control