private void RePrint_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
        {
            if (frmReprint != null && !frmReprint.IsDisposed)
            {
                frmReprint.Show();
                frmReprint.BringToFront();
            }
            else
            {
                frmReprint = new FrmReprint();
                frmReprint.ShowInTaskbar = false;
                frmReprint.Show();
            }
        }

------解决方案--------------------
传个变量控制显示与隐藏

------解决方案--------------------
用2号窗口控制1！