Window resizing from within MonoGame

I have just tried this , and to my surprise it did nothing

    [DllImport("user32.dll")]
    public static extern int SendMessage(IntPtr hWnd, int wMsg, IntPtr wParam, IntPtr lParam);

    public static void Maximise()
    {
        System.IntPtr wParam = new System.IntPtr(0xF030);
        System.IntPtr lParam = new System.IntPtr(0);
        SendMessage(Game1.Instance.Window.Handle, 0x112, wParam, lParam);

    }

Which sends a message WM_SYSCOMMAND with a wParam of SC_MAXIMIZE

This should work…