void MainWindow_Loaded(object sender, RoutedEventArgs e)
        {
            /* Create a graph viewer
             */
            GViewer graphViewer = new GViewer();

            graphViewer.BindToPanel(this.Graph_DockPanel);

            /* Create a graph */
            Graph graph = new Graph();

            graph.AddEdge("a", "b");

            /* Connect graph to graphviewer */
            graphViewer.Graph = graph;
        }