private void mornitoringSecondClick(object sender, RoutedEventArgs e)
 {
     if (monitoringSecondp == null)
     {
         MonitoringSecondPage p = new MonitoringSecondPage();
         monitoringSecondp = p;
     }
     content.Content = monitoringSecondp;
     CurrentControl  = content;
 }
        private void mornitoringSecondClick(object sender, RoutedEventArgs e)
        {
            MonitoringSecondPage p = new MonitoringSecondPage();

            content.Content = p;
        }