Implement a lazy loaded property in Silverlight

Here's an example from this forum thread:
private bool _loadingScore = false;

private static PropertyInfo ScoreInfoProperty = 
  RegisterProperty(new PropertyInfo("ScoreInfo", "ScoreInfo"));
public Score ScoreInfo
{
  get
  {
    if (!_loadingScore && (!FieldManager.FieldExists(ScoreInfoProperty) || ReadProperty(ScoreInfoProperty) == null))
    {
#if SILVERLIGHT
      _loadingScore = true;
      Score.GetScore(
        ReadProperty(ProfileIDProperty), 
        ReadProperty(PersonNameProperty), 
        ReadProperty(NicknameProperty), 
        ReadProperty(TeamIDProperty),
        ((TeamMemberInfoList)this.Parent).ParentTeam.Name, 
        (o, e) =>
          {
            LoadProperty(ScoreInfoProperty, e.Object);
            OnPropertyChanged(ScoreInfoProperty.Name);
            _loadingScore = false;
          }
        );
#else
      LoadProperty(ScoreInfoProperty, Score.GetScore(
        ReadProperty(ProfileIDProperty), 
        ReadProperty(PersonNameProperty), 
        ReadProperty(NicknameProperty), 
        ReadProperty(TeamIDProperty), 
        ((TeamMemberInfoList)this.Parent).ParentTeam.Name));
#endif
    }
    return GetProperty(ScoreInfoProperty);
  }
}