public bool RequestClose()
        {
            WorkBookPageCloseArgs args = new WorkBookPageCloseArgs();

            OnPageCloseRequested(this, args);

            bool ret = !args.Canceled;

            if (ret)
            {
                OnPageClose();
            }

            return(ret);
        }
 protected virtual void OnPageCloseRequested(object sender, WorkBookPageCloseArgs args)
 {
 }