Żeby zrobić forme okrgłą trzeba wpisac:
SetWindowRgn(Handle,CreateEllipticRgn(0, 0, Width, Height), True);a jak zrobic zeby forma była roundsquare, wsadzałem to zamiast eliptic, ale nmiedziałało
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CreateEllipticRgn Creates an elliptical region.
CreateEllipticRgnIndirect Creates an elliptical region.
CreatePolygonRgn Creates a polygonal region.
CreatePolyPolygonRgn Creates a region consisting of a series of polygons.
CreateRectRgn Creates a rectangular region.
CreateRectRgnIndirect Creates a rectangular region.
[b]CreateRoundRectRgn[/b] Creates a rectangular region with rounded corners.
(wprost z msdn.microsoft.com)