using a MEF imported interface on a background thread in Silverlight

I ran into an issue of using an MEF imported interface on a background thread. My interface that I wanted to compose on the background thread is IStockInfo. I want it to be callable on a background thread . I hit a wall in trying create my catalog on the background thread so came up with this solution that worked for me:

  public class Class1
    {
        Thread t = new Thread()
        t.start();
        [import]
        IStockInfo TheModel { get; set; } //this interface is in a composible part
        void t (Dispatcher mainThread)
        {
            //on the UI thread use the Parts to create our catalog from all the assemblies
            //and make the calling thread wait till we are done
            mainThread.BeginInvoke(() =>
            {
                foreach (var assemblyPart in Deployment.Current.Parts)
                {
                    Stream stream = Application.GetResourceStream(new Uri AssemblyPart.Source, UriKind.Relative)).Stream;
                    Assembly assembly = assemblyPart.Load(stream);
                    cat.Catalogs.Add(new AssemblyCatalog(assembly));
                }
                m_autoResetEvent.Set(); //we are done
            });
            m_autoResetEvent.WaitOne(); //wait for the UI thread
            container = new CompositionContainer(cat);
            CompositionHost.Initialize(container);
            try
            {
                CompositionInitializer.SatisfyImports(this);
            }
            catch (Exception e)
            {
            }
                theModel.GetSomeThing();
            }
    }

The issues were:
1 could not do the CompositionInitializer.SatisfyImports(this) on the UI Thread and pass theModel to the background thread as this results in a cross thread issue
2. so I came up with method where I have to call Deployment.Current.Parts on the UI thread thus the Dispatcher delegate, I used a autoResetEvent to synchronize the two threads (could have used UISync.Send or other methods)