Using MEF to Expose Interfaces in Your Silverlight MVVM Apps: Listing 1


public class CompositionNavigationBehavior : Behavior<Frame> {
  private bool processed;
  public CompositionContainer Container { 
    get; set; 

  public CompositionNavigationContentLoader Loader { 
    get; set; 

  public CompositionNavigationBehavior() {
    if (!DesignerProperties.IsInDesignTool)

  protected override void OnAttached() {
    if (!processed) {
       processed = true;

  private void RegisterNavigationService() {
    var frame = AssociatedObject;
    var svc = new NavigationService(frame);

  private void SetContentLoader() {
    var frame = AssociatedObject;
    frame.ContentLoader = Loader;
    frame.JournalOwnership = JournalOwnership.Automatic;
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