>After using: _screen.picture = "picture_name"
>Fox Pro tiles the picture on the screen. How can i center it ?

Arda,
Instead of _screen.picture use image object.

_screen.addobject('myWallpaper','image')
with _screen.myWallPaper
  .picture = getpict()
  .top = (_screen.Height - .Height) / 2
  .left = (_screen.Width - .Width) / 2
  .visible= .t.
endwith

Cetin