private void tsmiShippingVendors_Click(object sender, EventArgs e) { FrmShippingVendor frmShippingVendor; if (FrmShippingVendor.Instance == null) { frmShippingVendor = new FrmShippingVendor(_myAccessToken); frmShippingVendor.MdiParent = this; frmShippingVendor.StartPosition = FormStartPosition.CenterScreen; frmShippingVendor.Show(); } else { FrmShippingVendor.Instance.WindowState = FormWindowState.Normal; FrmShippingVendor.Instance.Show(); FrmShippingVendor.Instance.BringToFront(); } }