private void buttonGoToHistory_Click(object sender, RoutedEventArgs e)
 {
     Content = new PatientTreatmentHistory(patient.HealthCareNo);
 }
 private void TreatmentHistory(object sender, RoutedEventArgs e)
 {
     Content = new PatientTreatmentHistory((((Patient)Patients_DataGrid.SelectedItem).HealthCareNo));
 }