protected override void OnClosing(System.ComponentModel.CancelEventArgs e)
        {
            if (isParentControlPanel)
            {
                parent.release();
            }
            else
            {
                eParent.release();
            }

            base.OnClosing(e);
        }
 protected override void OnClosing(System.ComponentModel.CancelEventArgs e)
 {
     parent.release();
     base.OnClosing(e);
 }