How to create a real time Chart (SfChart) using MVVM in WPF

<chart:SfChart x:Name="Chart" Margin="0,20,20,0" AreaBorderThickness="0,1,1,1">
            <chart:SfChart.DataContext>
                <local:DataGenerator/>
            </chart:SfChart.DataContext>
            <chart:SfChart.PrimaryAxis>
                <chart:DateTimeAxis LabelFormat="hh:mm:ss">
                    <chart:ChartAxis.Header>
                        <TextBlock Margin="10" Text="Time" FontSize="16" FontFamily="SegoeUI"/>
                    </chart:ChartAxis.Header>
                </chart:DateTimeAxis>
            </chart:SfChart.PrimaryAxis>
 
            <chart:SfChart.SecondaryAxis>
                <chart:NumericalAxis Minimum="1000" Maximum="1006" 
                                     Interval="1" >
                    <chart:ChartAxis.Header>
                        <TextBlock Margin="10" Text="Value" FontSize="16" FontFamily="SegoeUI"/>
                    </chart:ChartAxis.Header>
                </chart:NumericalAxis>
            </chart:SfChart.SecondaryAxis>
 
            <chart:FastLineBitmapSeries EnableAntiAliasing="False" Label="First" 
                                        XBindingPath="Date" YBindingPath="Value" 
                                        LegendIcon="SeriesType" StrokeThickness="1"
                                        ItemsSource="{Binding DynamicData}"/>
            <chart:FastLineBitmapSeries EnableAntiAliasing="False" Label="Second" 
                                        XBindingPath="Date" YBindingPath="Value1" 
                                        LegendIcon="SeriesType"   StrokeThickness="1"
                                        ItemsSource="{Binding DynamicData}"/>
            <chart:FastLineBitmapSeries EnableAntiAliasing="False" Label="Third" 
                                        XBindingPath="Date" YBindingPath="Value2" 
                                        LegendIcon="SeriesType"  StrokeThickness="1"
                                        ItemsSource="{Binding DynamicData}"/>
 
        </chart:SfChart>

public class Data
    {
        public Data(DateTime date, double value, double value1, double value2)
        {
            Date = date;
            Value = value;
            Value1 = value1;
            Value2 = value2;
        }
 
        public DateTime Date { get; set; }
 
        public double Value { get; set; }
 
        public double Value1 { get; set; }
 
        public double Value2 { get; set; }
    }

public class DataGenerator
    {
        private Random randomNumber;
        private ObservableCollection<Data> data = new ObservableCollection<Data>();
        public int dataCount = 50000;
        private int rate = 5;
        int index = 0;
        DispatcherTimer timer;
        public ObservableCollection<Data> DynamicData { get; set; }
 
        public DataGenerator()
        {
            randomNumber = new Random();
            DynamicData = new ObservableCollection<Data>();
            data = GenerateData();
            LoadData();
 
            timer = new DispatcherTimer();
            timer.Tick += timer_Tick;
            timer.Interval = new TimeSpan(0, 0, 0, 0, 50);
            timer.Start();
        }
 
        public void AddData()
        {
            for (int i = 0; i < rate; i++)
            {
                index++;
                if (index < 100)
                {
                    DynamicData.Add(this.data[index]);
                }
                else if (index > 100)
                {
                    DynamicData.RemoveAt(0);
                    DynamicData.Add(this.data[(index % (this.data.Count - 1))]);
                }
            }
        }
 
        public void LoadData()
        {
            for (int i = 0; i < 10; i++)
            {
                index++;
                if (index < data.Count)
                {
                    DynamicData.Add(this.data[index]);
                }
            }
        }
 
        public ObservableCollection<Data> GenerateData()
        {
            ObservableCollection<Data> generatedData = new ObservableCollection<Data>();
 
            DateTime date = new DateTime(2009, 1, 1);
            double value = 1000;
            double value1 = 1001;
            double value2 = 1002;
            for (int i = 0; i < this.dataCount; i++)
            {
                generatedData.Add(new Data(date, value, value1, value2));
                date = date.Add(TimeSpan.FromSeconds(5));
 
                if ((randomNumber.NextDouble() + value2) < 1004.85)
                {
                    double random = randomNumber.NextDouble();
                    value += random;
                    value1 += random;
                    value2 += random;
                }
                else
                {
                    double random = randomNumber.NextDouble();
                    value -= random;
                    value1 -= random;
                    value2 -= random;
                }
            }
 
            return generatedData;
        }
 
        private void timer_Tick(object sender, EventArgs e)
        {
            AddData();
        }
    }