I need to create non-rectangular window without border and without title bar. More exactly I need a picture( not rectangular shape) to behave like window, it means there is some "hot" area on the picture so that when user click mouse button on it and move i want to move entire picture. I tried to implement common window and transparently blitting on it, but the problem is when I begin moving it this transparent area outside picture is not redrawn. I also tried to specify window region by SetWindowRegion, but also are outside picture( or window region) is not redrawn. What way can I implement this?