/// <summary>
        /// this method is called when user click on the create Networkx
        /// graph option under the File menu.
        /// </summary>
        private void _CreateNetworkXGraph()
        {
            GraphWin graphWin = new GraphWin();

            graphWin.Show();
        }
 /// <summary>
 /// this method is called when user click on the create Networkx
 /// graph option under the File menu.
 /// </summary>
 private void _CreateNetworkXGraph()
 {
     GraphWin graphWin = new GraphWin();
     graphWin.Show();
 }