public static void ShowCassirFrm()
        {
            //CurentOrderfrm.Topmost = true;

            try
            {
                CurentOrderfrm.Hide();
                CurentOrderfrm.Show();
            }
            catch
            {
                CurentOrderfrm = new WPFControls.frmCassir();
                CurentOrderfrm.OnCancelChange += new WPFControls.frmCassir.ChangeCancelEventHandler(CurentOrderfrm_OnCancelChange);
            }
        }