>Is there an easy way to control the default behavior of grid navigation when a field is entered? When I enter data into a cell, I would like the cell focus to move to the cell below, rather than to the cell to the right. Is there an easy way to do this without writing an elaborate validation method?

In the cell Keypress, you can check for Enter or Tab key and if so, do a Nodefault and then a Keyboard for a downarrow instead.