ListBox

XAML
  <ListBox Name="listBox1" SelectionChanged="listBox1_SelectionChanged"
    MouseDoubleClick="listBox1_MouseDoubleClick"  />

CS

  private initListeBox1() {
    listBox1.Items.Clear();
    listBox1.Items.Add("abc");
    listBox1.Items.Add("def");
    listBox1.Items.Add("ghi");
    listBox1.Items.Add("jkl");
    if (listBox1.Items.Count > 0) {
      listBox1.SelectedIndex = 0;
    }
  }

  private void listBox1_SelectionChanged(object sender, SelectionChangedEventArgs e)  {
    showFields();
  }

  private void showFields() {
     int i = listBox1.SelectedIndex;
     if ((!start) && (i >= 0)) {
         string table = (string)listBox1.SelectedItem;
     }
  }