Detecting Find and Replace complete

Is there anything in the find and replace objects that will help me detect when the user has searched the whole document and is back at the selection point they started at? (assuming I am calling .FindNext repeatedly in response to a user clicking on our Find Replace dialog). I can compare the startoffset but the find / replace may have modified the text content so that the original offset is no longer the same point in the text as at the start of the find replace operation (if that makes sense).