how to fire click listbox event gwt

Question

I have a listbox. I want to fire a click event which clicks this listbox and we can see the items inside the list.

Things I have tried and did not work-

1)   

  DomEvent.fireNativeEvent(Document.get().createClickEvent(0, 0, 0, 0, 0,
    false, false, false, false), listbox);

2)

 public static native void click(ListBox listbox)/*-{
  listbox.click();
  }-*/;

3)
  DomEvent.fireNativeEvent(Document.get().createChangeEvent(), yourListBox);

Answer 1

This works, but only in chrome.

listbox.getElement().dispatchEvent(
    Document.get().createMouseDownEvent(0, 0, 0, 0, 0, 
            false, false, false, false, Event.BUTTON_LEFT));

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