private void btnSave_Click(object sender, RoutedEventArgs e)
 {
     LoggedInOperations.saveDrugChanges();
 }
 private void btnDeleteSelectedDrug_Click(object sender, RoutedEventArgs e)
 {
     LoggedInOperations.deleteSelectedDrug();
 }
 private void btnRefreshDrugs_Click(object sender, RoutedEventArgs e)
 {
     LoggedInOperations.refreshDrugsDataGrid();
 }