bug in Dropdown ?

bug in Dropdown ?


Hello,
i create a form with Dropdown. In dropdown i have as possibility just CHOICE 1.

in Script i have 

for each line in MySubform
{
ml = List:String();
ml.add(line.SingleLine);
}

input.MyDropDown:ui.add(ml);

I can see in my dropdown all line of my subform. I submit.

When i reopen my form the dropdown is already equal to CHOICE 1, all line have disappear !!!!

a bug  or it's not possible to add new value in dropdown with script deluge ?

thanks you