AW.Templates.Combo setAttribute disabled true in IE is throwing error

Hi
I have this piece of code in my script.

obj.setCellTemplate(new AW.Templates.Combo, 1);
    obj.getCellTemplate(1).setAttribute("disabled",true);

The problem is that while the cell is showing as disabed, When the dropdown button is clicked it throws a javscript error that cannot focus because the field is not focusable or does not accept focus etc. The Combo also drops down to show the values and the value can then be selected.

Is this a bug ?
How can I disable the cellTemplate for a row with combo box otherwise?

Thanks