Question about WM_MDITILE, MDITILE_VERTICAL

In a MDI application I open several windows. After opening the windows are overlapping each other and then I will to arrange them with the program lines:

                case (IDM_VTILE)

                   iret = SendMessage(ghwndClient, &

                                  WM_MDITILE, MDITILE_VERTICAL, 0)                  

                   MDIWndProc = 0

                   return

This works fine, but let’s say I have three windows. Window number 3 will be at the left,

window 2 in the middle and window number 1 to the right.

I want the windows to be arranged in reversed order compared to what Windows does.

Is there any (simple) way to solve this?