I'm trying to make my form semi-transparent using WinAPI SetLayeredWindowAttributes() (VFP6SP5,Win2000). When the form is "As Top-Level" (ShowWindow=2) this function works, otherwise (In Screen or In Top-Level form) - not. Why? Please, help!

Code here:
R=GetWindowLong(HWND,-20)
R=bitor(R,0x00080000)
SetWindowLong(HWND,-20,R)
SetLayeredWindowAttributes(H,0,TransparencyLevel,2)

Thanks.

P.S. Can I get semi-transparent form under W9x?