TRichView.com

Hi Sergey,
Suppose someone gave me a paper and wanted me to review it through a trichview editor, then i did some changes on this paper such as deleting or adding some sentences, changes some words' font and so on. Now i want to keep these edit signs on the editor like Microsoft Word's redaction, then my friend can easily find which changes i have done on the paper.
My question is, how to implement above functions in trichview? Thank you!

It's not possible using documented methods, they only allow the get type of the last operation (see UndoAction, RedoAction, UndoName, RedoName).
Look in the code for these functions, you will be able to find solution for this problem.
In the end, these functions return UndoType or Caption properties of the last item in undo/redo list for the proper cell inplace editor or the main document. You can write your function returning these properties for all items in undo/redo lists.