Java HtmlUnit onchange event not fired

I use HtmlUnit to fill form. I have a select SELECT_A. After selecting option the additional elements must appe开发者_如何学Pythonar in the page. But it's not working! I simulate Firefox 3.6.

What do you think?

I tried to use NicelyResynchronizingAjaxController() but it does not help.

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One note: fireEvent should be called with "change" parameter, not "onchange". Or fireEvent(Event.TYPE_CHANGE); is even better.

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You can use the method fireevent("EventName") and pass eventname as a paramenter:

HtmlSelect fromselect = form.getSelectByName("droplist");
fromselect.fireEvent("onchange");