Occurs, if the document's text has been altered and the spelling of the new text must be checked. This event occurs only, if the WPF.TextControl.IsSpellCheckingEnabled property has been set to true. The event handler receives an argument of type SpellCheckTextEventArgs containing data related to this event.
[C#] public event SpellCheckTextEventHandler SpellCheckText;
[Visual Basic] Public Event SpellCheckText As SpellCheckTextEventHandler