private void showNodeDetail(SelectedNodeChangeEventArgs e)
        {
            Tuple <string, string> tuple = map.GetNodeDescription(e.Message);

            txtBoxScenicName.Text    = tuple.Item1;
            txtBlockDescription.Text = tuple.Item2;
        }
 private void on_SelectedNode_Changed(object sender, SelectedNodeChangeEventArgs e)
 {
     showNodeDetail(e);
     map.SetHighlightNode(e.Message);
 }