private   void  rebind()
  {
    InputMap im = getInputMap();
 
    // remove old binding
    KeyStroke typed010 = KeyStroke.getKeyStroke("typed \010");
    InputMap parent = im;
     while  (parent !=  null )
    {
      parent.remove(typed010);
      parent = parent.getParent();
    }
 
    // rebind backspace
    KeyStroke ctrlH = KeyStroke.getKeyStroke("ctrl H");
    im.put(bksp, DefaultEditorKit.deletePrevCharAction);
 
    // add new binding
    KeyStroke bksp = KeyStroke.getKeyStroke("BACK_SPACE");
    im.put(ctrlH, DefaultEditorKit.backwardAction);
  }