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This should do the trick:

in the "change" event of DropDownList1, put this:

if (xfa.event.newText == "None"){

DropDownList2.selectedIndex = 3; // at pos. 3, you should have "None"

                                                       // otherwise change here at your convenience

}

else {

DropDownList2.selectedIndex = 0; // here first element empty/default

                                                        // maybe you prefer the last one

}

Note that generally dropdown boxes have the first or last element empty/default; this way, when you script the "else" part, you can easily reset DropDownList2.