how to dispatchEvent ?

hi,

I'm trying to dispatch newly created event. it doesn't show error but newly added event doesn't input new code in editor window. I think there is something wrong in dispatching event.

 var newEvent = document.createEvent("KeyEvents");
        newEvent.initKeyEvent("keypress", true, true, window,false, false, false, false, 0, codes[whichChar]);
        console.log(charCode + ' = '  + whichChar + ' ' + newKey + ' ' + txt);
      
      
      e.data.preventDefault();
      var x = document.getElementById('editor2');
         x.dispatchEvent(newEvent);

This code works in FCKEditor 2.4.x

 var newEvent = null;      
    try
    {    
        var newEvent = document.createEvent("KeyEvents");
        newEvent.initKeyEvent("keypress", true, true, window,false, false, false, false, 0, codes[whichChar]);
    }
    catch(ex)
    {
      newEvent = document.createEvent("KeyboardEvents");
      newEvent.initKeyEvent('keypress', false, true, window, false, false, false, false, codes[whichChar], 0);
    }
      e.preventDefault();
      e.target.dispatchEvent(newEvent);