thank your answer..  thank you..

public boolean onEventPreview(Event evt) {
                evt.preventDefault();       <-------- add this method
( 1 )
                int keyCode = DOM.eventGetKeyCode(evt);
                boolean ctrl = DOM.eventGetCtrlKey(evt);
                if  (  ctrl && keyCode == 83  ) {  // 83 is 's'  ->
ctrl + s
               evt.preventDefault(); <-------------- add this metohd
( 2 )
                save();
                return false;
              }
           return true;
        }
     public void save(){
   ~~~~
  ~~~~~
    }

add ( 1 ).. not work
add ( 2 ).. not work

add (1) (2) work..

so I solve this problem...
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