private void btnCitas_Click(object sender, EventArgs e)
 {
     Operation = Helpers.Operation.CREATE;
     tabControl.SelectedTab = tabDetalle;
     LimpiarControles();
     DisableControl(true);
 }
 private void btnModificar_Click(object sender, EventArgs e)
 {
     Operation = Helpers.Operation.EDIT;
     tabControl.SelectedTab = tabDetalle;
     DisableControl(true);
 }