private void bCreate_Click(object sender, RoutedEventArgs e)
 {
     if (txtFName.Text != "" && txtLName.Text != "" && txtGender.Text != "" && txtAddress.Text != "" && txtPhoneNo.Text != "" && txtEmail.Text != "" && txtBirthdate.Text != "")
     {
         bool success = _fService.CreateNewPerson(txtFName.Text, txtLName.Text, txtGender.Text, txtAddress.Text, txtPhoneNo.Text, txtEmail.Text, txtBirthdate.Text);
         if (success)
         {
             ContentControlSuccess.Content = new DisplaySuccess("Kunde er blevet oprettet");
             ((MainWindow)Application.Current.MainWindow).TabCustomer.UpdateDataGrid();
         }
         else
         {
             ContentControlSuccess.Content = new DisplayError("FEJL!");
         }
     }
     else
     {
         ContentControlSuccess.Content = new DisplayError("Alle felter skal udfyldes!");
     }
 }