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rich text box issue

I have one more issue, please help me to find the solution ,
My question as follows..

In the rich text box, after an undo or redo operation how can we get
information on the following things..
1) which operation has happened(paste, insert or overwrite)
2) Which line numbers are affected by the undo/redo operation
3) How can we get the newly inserted text.

Looking forward for your reply..
Warm Regards
Nov 16 '05 #1
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