I have some columns on my grid with the option $col["hidden"] = true;, which are hidden from my grid, as required. However, some other columns have this option, and are not being hidden.

Code for a column that is being hidden:

$col = array();
$col["name"] = "nominalExport";
$col["hidden"] = true;
$col["hidedlg"] = true;
$col["export"] = true;
$cols[] = $col;


Code for a column that is not being hidden:

$col = array();
$col["name"] = "s1Cp1Bb1";
$col["hidden"] = true;
$col["hidedlg"] = true;
$col["export"] = true;
$cols[] = $col;


As far as I can tell, both columns are defined in the exact same way. Any idea why some columns are being successfully hidden, and not others?