>Visible property is 1/0 not code.

This is NOT true, that's why you have the Expression Builder, the small button which says fx. just enter !Empty(this.controlsource) there, and it will show as =!Empty(this.controlsource) in the property sheet. And you must change the Sparse property, as I wrote.

>I entered the followin code in the grid.init:

if empty(crsrprc.comments)
>This.Column6.Command1.Visible=.f.
>endif

but it's didn't do nothing.

That's because this will evaluate only ONCE, namely when the grid is created.