[Mono-winforms-list] Graphics.FromHwnd(IntPtr.Zero) not working

[Stefano Del Furia]

Hi,
i'm using Graphics.FromHwnd(IntPtr.Zero) for drawing directly on screen but 
under Ubuntu 9.04 it don't work. 
The method don't return a null value but when i try to draw some object like 
a a line nothing happened like in this way:

            Graphics g = Graphics.FromHwnd(IntPtr.Zero);
            Point pMousePos = new Point(e.X, e.Y);
            g.DrawLine(p, pMousePos, lastPoint);

What am i wrong ??
Thanks in advance.
Stefano
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