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;

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