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What about percentage, such as  .025% . Is there a format for percentage?

There is no special "percent" cell, but you can use NumberFormat function. Just define column as "edn" (editor , numeric) and call

            grid.setNumberFormat("0.000%",column_index)

Such command will cause output with 3 digits after point and with "%" sign at the end.

Also you can create your own ExCell for such purpose.

The information connected with cell add topic and combo box jsp also can help you, so please check it too.