static extern int TileWindows(IntPtr hwndParent, int wHow, IntPtr lpRect, int cKids, IntPtr lpKids);

static extern int TileWindows(IntPtr hwndParent, int wHow, IntPtr lpRect, int cKids, [MarshalAs(UnmanagedType.LPArray)]IntPtr[] lpKids);

<System.Runtime.InteropServices.DllImportAttribute("user32.dll", EntryPoint:="TileWindows")> _

    Private Shared Function TileWindows(ByVal hwndParent As System.IntPtr, ByVal wHow As UInteger, ByVal lpRect As RECT, ByVal cKids As UInteger, ByVal lpKids() As System.IntPtr) As UShort

            TileWindows(IntPtr.Zero, MDI_TILE.SKIPDISABLED, _