private void AnalysisButton_Click(object sender, RoutedEventArgs e)
 {
     if (MainWindow.CurrentUser.firstname == "Guest")
     {
         MainWindow.showMustLogIn();
         return;
     }
     else if (MainWindow.CurrentUser.role.Trim() != "analysis")
     {
         showMustBeAnalysis();
         return;
     }
     MainWindow.aw = new AnalysisWindow();
     MainWindow.aw.Show();
 }