Currency format in form and grid

Hi all, Currently, I use Aras 11 sp9. My item has a property with data type = decimal. I want to make format with thousand separate, for ex: when I type in form = 100000, aras will show 100,000, it's also show in main grid and relationship grid. How can I do that? I thinks it's just a option such as properties formatting. I hope I do not need create any methods :)