Black Border around dialog box..

Hi all..

I'm using AnimateWindow for Bubble window or PopUp window for Win98, Win 2000 and above... As i've to run my exe on Win95 and NT also so for that i'm making that window with the help of calculating coordinates and SetWindowPos. After that i fill my dialog box with some color..

So the problem is that whenever i run my code without using AnimateWindow it works fine.. But when i introduce AnimateWindow it shows a black border around dialog box.

Can anyone explain this??

Thank you..