Hi Cho,
Thank you for your interest in Nevron Chart for .NET.
The following code shows how create a realtime chart has a scrollbar positioned at the end of the range:
  Random m_Rand = new Random();

   private void Form1_Load(object sender, EventArgs e)
   {
    NChart chart = nChartControl1.Charts[0];

    NBarSeries bar = new NBarSeries();
    bar.DataLabelStyle.Visible = false;
    chart.Series.Add(bar);

    chart.Axis(StandardAxis.PrimaryX).PagingView = new NNumericAxisPagingView();

    nChartControl1.Controller.Tools.Add(new NPanelSelectorTool());
    nChartControl1.Controller.Tools.Add(new NAxisScrollTool());

    timer1.Start();
   }

   private void timer1_Tick(object sender, EventArgs e)
   {
    NChart chart = nChartControl1.Charts[0];

    NBarSeries bar = chart.Series[0] as NBarSeries;

    bar.Values.Add(m_Rand.Next(100));

    if (bar.Values.Count > 10)
    {
      while (bar.Values.Count > 100)
      {
       bar.Values.RemoveAt(0);
      }

      nChartControl1.RecalcLayout();

      NAxis xAxis = chart.Axis(StandardAxis.PrimaryX);
      chart.Axis(StandardAxis.PrimaryX).ScrollBar.Visible = true;
      chart.Axis(StandardAxis.PrimaryX).PagingView.ZoomIn(new NRange1DD(xAxis.ContentRange.End - 10, xAxis.ContentRange.End), 0.1);
    }

In this example the scrollbar will appear when the number of data points is above 10. Also keep in mind that it is a good idea to remove data points after a certain threshold to reduce computations.
Please let us know if you have any questions or meet any problems.

Best Regards,
Nevron Support Team