why I get position coordination(0,0,1,1)(left, top, width, height) with IAccessible->accLocation?

I try to use IAccessible->accLocation to get some child element's position information in some metro applications like "finance", why I get position coordination(0,0,1,1)(left, top, width, height) ? how can I get the real position like (10,10,125,125).Is there other ways?