在使用SimpleModal阻止onClose之后，默认的关闭控制不起作用

onClose

.. 
    function onModalClose() {
       if (this.dirty && 
             !confirm(\'You have unsaved changes, continue anyway?\')) {
           return;
       } 
       this.dirty=false;
       $.modal.close();
    }
..

$.modal.close()

 onClose: function () {
     if (this.dirty &&
            !confirm(\'You have unsaved changes, continue anyway?\')) {
         this.bindEvents();
         this.occb = false;
         return;
     }
     $.modal.close();
  }