Non-rectangular window

Hi
I’m newbee in Xojo, it looks good, but I have one problem.
Please, answer - how I can use non-rectangular window in my application?
I 've seen plugin from MonkeyBread, but it works only for Windows, not MacOS&Linux…

Is it possible ?

Thank you

I think that http://documentation.xojo.com/index.php/Window.MacProcID is not what you are seeking.