fire custom save event when Save button pressed

I was following the steps written in this topic:http://stackoverflow.com/questions/1956967/ckeditor-ajax-save I tried to fire a custom 'saved.ckeditor' event if anybody press the AjaxSave button. But I did not succeeded.

ckeditor/plugins/ajaxsave/plugin.js:

    (function()
    {  var saveCmd =
     {  
        modes : { wysiwyg:1, source:1 },  
        exec : function( editor )  
        {
            editor.fire('saved.ckeditor');
            $(editor).trigger('saved.ckeditor', editor.getData());
        }
      }
    var pluginName = 'ajaxsave';
    CKEDITOR.plugins.add( pluginName,
    {
        init : function( editor )
      {
        var command = editor.addCommand( pluginName, saveCmd );
        command.modes = { wysiwyg : !!( editor.element.$.form ) };
        editor.ui.addButton( 'AjaxSave',
         {
            label : editor.lang.save,
            command : pluginName,
            className : 'cke_button_save'
         });
     }
   });  
})();