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[SlimDX] Why won't this program draw anything

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This program compiles fine, and clears the screen to blue but doesn't draw my triangles. I compared it almost line to line with the MiniTri sample and can't find anything wrong with it.
[StructLayout(LayoutKind.Sequential)]
    struct TransformedColoredVertex
    {
        public Vector4 Position;
        public int color;
    }

    static class Program
    {
        static Direct3D d3d;
        static Device d3dDevice;
        static VertexBuffer triangleBuff;


        [DllImport ( "User32.dll" )]
        [return: MarshalAs ( UnmanagedType.Bool )]
        static extern bool PeekMessage(out Message msg, IntPtr hWnd, uint messageFilterMin, uint messageFilterMax, uint flags);

        

        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            Form form = new Form ();
            form.ClientSize = new Size ( 600, 600 );
            form.Text = "Test Form";
            form.Visible = true;

            d3d = new Direct3D ();
            
            PresentParameters PresentParams = new PresentParameters ();
            PresentParams.BackBufferHeight = form.ClientRectangle.Height;
            PresentParams.BackBufferWidth = form.ClientRectangle.Width;
            PresentParams.DeviceWindowHandle = form.Handle;
            PresentParams.SwapEffect = SwapEffect.Discard;
            PresentParams.Windowed = true;
            
            d3dDevice = new Device ( d3d, 0, DeviceType.Hardware, form.Handle, CreateFlags.HardwareVertexProcessing, PresentParams );

            triangleBuff = new VertexBuffer ( d3dDevice, 20 * 3, Usage.WriteOnly, VertexFormat.None, Pool.Managed );

            DataStream stream = triangleBuff.Lock ( 0, 0, LockFlags.None );

            TransformedColoredVertex[] triVerts = new TransformedColoredVertex[3];
            triVerts[0].color = Color.Black.ToArgb();
            triVerts[0].Position = new Vector4 ( 400.0f, 100.0f, 0.5f, 1.0f );
            triVerts[1].color = Color.Blue.ToArgb ();
            triVerts[1].Position = new Vector4 ( 400.0f, 400.0f, 0.5f, 1.0f );
            triVerts[2].color = Color.Red.ToArgb ();
            triVerts[2].Position = new Vector4 ( 400.0f, 100.0f, 0.5f, 1.0f );

            stream.WriteRange ( triVerts );
            triangleBuff.Unlock ();

            Application.Idle += new EventHandler(Program.OnIdle);

            Application.Run (form);
            
            d3dDevice.Dispose ();
            d3d.Dispose ();
            form.Dispose ();
        }

        public static void OnIdle( object obj, EventArgs eventArgs)
        {
            Message msg;
            
            while (!PeekMessage ( out msg, IntPtr.Zero, 0, 0, 0 ))
            {

                d3dDevice.Clear ( ClearFlags.Target | ClearFlags.ZBuffer,  Color.Blue.ToArgb(), 1.0f, 0 );
                d3dDevice.BeginScene ();

                d3dDevice.SetStreamSource ( 0, triangleBuff, 0, 20 );
                d3dDevice.VertexFormat = VertexFormat.PositionRhw | VertexFormat.Diffuse  ;
                d3dDevice.DrawPrimitives ( PrimitiveType.TriangleList, 0, 1);

                d3dDevice.EndScene ();
                d3dDevice.Present ();
            }
        }
    }

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