Shoutbox

please, see my code

code:

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var RECT = Interop.Allocate(16);
RECT.WriteDWORD(0, 0);
RECT.WriteDWORD(4, 0); 
RECT.WriteDWORD(8, 0); 
RECT.WriteDWORD(12, 0);

Interop.Call("user32.dll", "RedrawWindow", ChatWnd.Handle, RECT, 1, 1);

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can you help me?, i need redraw a window