private void Mouse_Moved(object pSender, MouseEventArgs pE)                 
{
  // Get mouse position in screen coords
  Point mousePosition = pE.GetPosition(pSender as IInputElement);

  // Convert mouse screen coords to world coords
  mousePosition = ActualMap.ToWorldCoordinate(mousePosition); 

  // Get the feature layer
  InMemoryFeatureLayer featureLayer = 
   (InMemoryFeatureLayer) ActualMap.FindFeatureLayer("SomeLayerName");

  // Get a list of all the features within the layer  
  featureLayer.Open();
    Collection<Feature> features  =
      featureLayer.QueryTools.GetAllFeatures(ReturningColumnsType.NoColumns);
  featureLayer.Close();

  // Loop through every feature and see if the mouse is within
  foreach (Feature feature in features)
  {
    BaseShape currentShape = feature.GetShape();

    // See if the mouse lies within the shape
    if (currentShape.Contains(mousePosition)
    {
      Console.WriteLine("yay"); // Of course, a breakpoint here :)<br />
    }

  } // foreach

} // event

// Debug :
Mouse   6032915,3281 1577624,0693
Shape 0 6123046,9403 1482548,3798
Shape 1 6033625,8535 1581123,6545
Shape 2 6033123,2443 1577457,7021