WndProc override

protected override void WndProc(ref Message m)
{
    base.WndProc(ref m);

    switch (m.Msg)
    {
        case 0x1:
            Rectangle recClient = RectangleToScreen(ClientRectangle);
            SetWindowPos(m.HWnd, IntPtr.Zero, recClient.Left, recClient.Top, recClient.Width, recClient.Height, 0x0020);
            break;
        case 0x83:
            NCCALCSIZE_PARAMS p = (NCCALCSIZE_PARAMS)Marshal.PtrToStructure(m.LParam, typeof(NCCALCSIZE_PARAMS));
            p.rgrc[0].left = p.rgrc[0].left + 0;
            p.rgrc[0].top = p.rgrc[0].top + 0;
            p.rgrc[0].right = p.rgrc[0].right - 0;
            p.rgrc[0].bottom = p.rgrc[0].bottom - 0;

            m.Result = IntPtr.Zero;
            break;
    }
}