Hi Luca,
I am not sure why your approach didn't work, sounds like it should.
However, another approach would be to update the values in the drop down list in the second column. You can do this with code in the change event of the first drop down list, so something like;
DropDownList2.rawValue = "";
switch (xfa.event.change) {
case "1": DropDownList2.setItems("A,B,C");
break;
case "2": DropDownList2.setItems("D,E,F");
break;
case "3": DropDownList2.setItems("H,I,J");
break;
}
This assumes you called the second drop down DropDownList2.
Regards
Bruce