Use system UI theme for drop down menus

It's very strange why windows only software, witch doesn't have 10+ year of history, doesn't use system theme for drop down menus. For example in Win7 with standard theme it's must be gray background with light blue selections, instead white background, heavy blue selection, and kill my eyes orange check boxes. It makes feel foreign guest in the system. So I think good idea to add more system look and feel.