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How to initialize MEF ServiceLocator.Current?
private void InitializeContainer()
        {
            var catalogs = new AggregateCatalog();

            var catalog = new AssemblyCatalog(Assembly.GetExecutingAssembly());
            catalogs.Catalogs.Add(catalog);

            // Also adding Interactions project
            catalog = new AssemblyCatalog(typeof(InteractionsService).Assembly);
            catalogs.Catalogs.Add(catalog);

            // initialize the main application composition host (container)
            CompositionHost.Initialize(catalogs);
        }

this.InteractionsService = ServiceLocator.Current.GetInstance<IInteractionsService>();

private CompositionContainer _container

//your code

var batch = new CompositionBatch();
batch.AddPart(this);

_container.Compose(batch);

//or more simply
_container.ComposeParts(this) //if this method is supported