How to scroll Silverlight DataGrid with mouse wheel

using System.Windows.Automation.Provider;
using System.Windows.Automation;

public class ScrollableDataGrid : DataGrid
{     
  public ScrollableDataGrid()
  {
    MouseWheel += delegate(object sender, MouseWheelEventArgs e)
    {
      (OnCreateAutomationPeer() as IScrollProvider).Scroll(ScrollAmount.NoAmount,
        e.Delta < 0 ? ScrollAmount.SmallIncrement : ScrollAmount.SmallDecrement);
    };
  }
}