Returns null as undo is not supported

C# | Visual Basic | Visual C++ |
public virtual RapidSpellChecker..::.State GetUndoableStatePoint()
Public Overridable Function GetUndoableStatePoint As RapidSpellChecker..::.State
public: virtual RapidSpellChecker..::.State^ GetUndoableStatePoint()

Returns the current state, or null if not supporting undo.