Thanks a lot for your answers. I apologize not to have replied earlier. I am actually in the real world helping my friend to build her house. Someday, I will tell that whole rock'n'roll story where SH3D mostly provided a significant help to avoid many problems.
Anyway, I tried to set the margin by editing info.plist like this :
I am running OS X 10.6 . Is that the correct way to do it ?
I have to go back to painting :)
