AutoComplete stopped working in 6.12

Converting from 1.4.7 to 6.12. The page runs, but the autocomplete field has
stopped working. It never produces an autocomplete, acting as if it were
simply a normal . More strangely, no code in the containing panel was
changed, nor do I see anything in the migration guide about
AutoCompleteTextField. I put the page into IE's debugger and no errors were
thrown.

Code snippet:
agcyCombo = new AutoCompleteTextField<String>("code",
new PropertyModel<String>(saveCriteria, "SearchString")) {
protected Iterator<String> getChoices(String input) {
if (Strings.isEmpty(input)) {
return Collections.EMPTY_LIST.iterator();

List<String> curMatchingList = CodeFilter.filter(getAgcyFedList(),
input);
if (curMatchingList.size() > MAX_NUM_CHOICE) {
return curMatchingList.subList(0, MAX_NUM_CHOICE - 1).iterator();

return curMatchingList.iterator();

};

wmcAgcy.add(agcyCombo.setLabel(new Model<String>("Agency")));
add(wmcAgcy);
return wmcAgcy;

HTML snippet:
<fieldset id="req">
<label for="agcy">Agency (required):</label>
<input id="agcy" type="text" wicket:id="code" maxlength="30"
value="Agency code and decode" />
</fieldset>

In the 1.4.7 version of the app, the input field looked like:
<input name="agcyPanel:contAgcy:code" class="ui-state-error" id="code13"
type="text" maxLength="30" wicketFocusSet="true" autocomplete="off"
value="D"/>

In 6.12 it produces:
<input name="agcyPanel:contAgcy:code" class="ui-state-error" id="code13"
type="text" maxLength="30" wicketFocusSet="true" autocomplete="off"
value="D"/>

So no apparent difference, but I don't see an onKeyPress event in either, so
i am not sure where to go to stick a breakpoint for that.