private void BtnAdd_Click(object sender, RoutedEventArgs e) { if (listSupplier.Items.Count > 0) { listSupplier.ScrollIntoView(listSupplier.Items[0]); } txbAddress.Clear(); txbIdSup.Clear(); txbEmail.Clear(); txbMoreInfo.Clear(); txbNameSup.Clear(); txbPhone.Clear(); btnAdd.IsEnabled = false; btnDelete.IsEnabled = true; IconDelete.Kind = MaterialDesignThemes.Wpf.PackIconKind.ContentSave; btnDelete.ToolTip = "Save"; btnEdit.IsEnabled = true; IconEdit.Kind = MaterialDesignThemes.Wpf.PackIconKind.Cancel; setTextBox(true); txbIdSup.IsEnabled = false; txbIdSup.Text = manage.Create_NewIdSupplier_Auto(); listSupplier.IsEnabled = false; txbIdSup.Focus(); if (refreshComboboxSup != null) { refreshComboboxSup.Invoke(true); } }