WPF Charting using MVVM Pattern

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Collections.ObjectModel;
using System.Windows.Controls.DataVisualization.Charting;

namespace WPFCharting
{
    /// <summary>
    /// Interaction logic for ucChart.xaml
    /// </summary>
    public partial class ucColumnSeriesChart : UserControl
    {
      private static ucColumnSeriesChart _ucCS;
      public ucColumnSeriesChart()
        {
            InitializeComponent();
            _ucCS = this;
        }
      public static ucColumnSeriesChart getInstance()
      {
          if (_ucCS == null)
          {
              _ucCS = new ucColumnSeriesChart();
          }
          return _ucCS;
      }
    }
}