public static ListaContrato getInstance()
{
if (ventana == null)
{
ventana = new ListaContrato();
}
return(ventana);
}
private void btnlistar_Click(object sender, RoutedEventArgs e)
{
ListaContrato.getInstance().Show();
ListaContrato.getInstance().Activate();
}
private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e)
{
ventana = null;
}
