I Test below source code................

 case TrackerKeyCode.CODE_F1:
   showHelp();
    DOM.eventPreventDefault(event);
    DOM.eventCancelBubble(event, true);

  propagate = false;
  break;
}
 ///////////////////////////////////////////////////// brower F1 evnet
work..

 case TrackerKeyCode.CODE_F1:
   showHelp();
  eventPreventDefault(evt);

  propagate = false;
  break;
}

public native void eventPreventDefault(Event evt) /*-{
        if (evt.preventDefault)
                evt.preventDefault();
        else
                evt.returnValue = false;
        }-*/;

///////////////////////////////////////////////////// brower F1 evnet
work..

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