Cyril,

You can use many ways:

1. "Soft". In Grid.Init() write
if .not. lIsUserManager
Grid.Columns(nColumn).Visible = .F.
endif

2. "Hard". In Grid.Init() write
if .not. lIsUserManager
Grid.DeleteColumn(nColumn)
endif

3. "Bad". In Grid.Columns(nColumn).Text1.When() write
if .not. lIsUserManager
return .F.
endif
This way bad becouse may cause screen flashing