private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            if (UsuariosModel.ObtenerUsuarioContraseña())
            {
                StyleManager.ApplicationTheme = new Windows8Theme();

                this.LaunchBusyIndicator();

                string path = ConfigurationManager.AppSettings["ErrorPath"].ToString();

                if (!File.Exists(path))
                {
                    Directory.CreateDirectory(path);
                }
            }
        }