But if you requery in the grid's OnRowChanged method, you would have to save the changes before you requery, wouldn't you?
That does not seem like a good solution. Also, if the user edits data in the grid, (and data is saved in the OnRowChanged method), and the user closes the form, the automatic "Data is changed, want to save?"-box will not appear, since the data has already been saved, without the users knowledge.