Get non rectangular area on a window

c# winforms class, this is a winforms class and in c#....... I have tried this before under other titles. So I decided a different approach this time. Please look at the following link: <[login to view URL]> This application deos exacylt what I am trying to do. When you install this application select the object capture type. When you move the mouse it highlights the selected area. So on windows 7 it draws the rounded corners. On yahoo messenger the corners are roundf at the top and at the bottom they are square. Please understand the only part of this that I need is getting the region to draw around the window or object. I am also including a different shaped form that it works on. There has to be some Win API to get these regions because it is too fast to be some kind of edge detection. Please use the above application to run on this form I am sending you. I just need the code that gets the region. I will repeat I just need the code that gets the region of the bounds of the window that is it. I do not need the capture part or the mouse move and hooking part. I just need that region that is draw around a NON rectangular window. Please remember the border that is drawn around and object is what I need. Thanks and good luck bidding.......