twork-graph', options);
  networkGraph.addNodes([
    {
      id: 'c',
      x: 140,
      y: 150,
      color: getRandomColor(),
      size: 20,
      text: {
        value: 'Node C',
        color: getRandomColor(),
        font: '12px Arial',
        xOffset: 0,
        yOffset: 32
      }
    },
    {
      id: 'd',
      x: 40,
      y: 150,
      color: getRandomColor(),
      size: 16,
      text: {
        value: 'D',
        color: getRandomColor(),
        font: '12px Arial',
        xOffset: 0,
 