private void radMenuItem_emitir_Click(object sender, EventArgs e) { try { if (Application.OpenForms["RadFormComprobante"] != null) { Application.OpenForms["RadFormComprobante"].Activate(); } else { RadFormComprobante radForm = new RadFormComprobante { Sesion = Sesion, MdiParent = this }; radForm.Show(); } } catch (Exception ex) { MessageBox.Show(ex.Message.ToString()); } }