In the meantime, I will look at the "leave" events as you suggested.
I'd appreciate your thoughts (and anyone else's) as to why I see only the Row Validating and not the Mouse Click, given what you said.
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If the focus is moved to a cell in the same row, then no other events occur.
If the focus is moved to a cell in another row, then both Row Validating and Row Validated are fired, containing the whole row data, including the new and the old values of the edited cells.