My simplest hack for this is to provide 2 copies of your currency value in the model: one thats a decimal that you "Bound" that column to and one that is a string formatted in the currency you want, on the server side and you use a Template to show that value on the bound column. So instead of:
But I would love to be able to pass a CultureInfo to the column's format method instead. And I'd love even more if I could do that with a client Template.