Aleksey,
thanks for the sample, It now works as expected...
I discovered at your sample that I had to change the Buffer mode of my CA.
Its different when I create a cursor from a SQL Server database, because there its not in Buffer at the begining, and this was my reference for the CA cursor.
(I learned something new)

Just another question
I was thinking to reindex the Cursor also in the AfterCursorRefresh method then sometimes the user, defines a new filter parameter, and I thing it was necessary to reindex the cursor again after a CursorRefresh, but if this is not necessary because the AfterCursorFill handles this, I just want to know what as a sample what can I control or do with the AfterCursorRefresh.

Again thanks for the sample and help provided.

Peter