You can 2 columns with same field, one for display, one for export.

For first set export=true, hidden=true with no fancy box link,
and other with export=false hidden=false with fancy box link.

The columns will have diferent names?

$col["name"] = "col_display";
$col["export"]=false;
$col["hidden"]=false;
$cols[] = $col;

$col["name"]="col_export";
$col["export"]=true;
$col["hidden"]=true;
$cols[] = $col;

And in sql select:

"….. tablecol as col_display, tablecol as col_export…"

Ok? Or there is another way to do it?

Thanks.

Yes, thats correct.