Dead lock with backgroundWorker

I faced with one interesting moment when working with multithreading. I have two threads. In main thread I create layout and add to it control,in second thread I create another control and add to the same layout. It works fine, but second thread works a bit longer then main. So main should wait for second thread.I use for this AutoResetEvent and got DeadLock. Below I describe code what I use:

 private static AutoResetEvent resetEvent = new AutoResetEvent(false);
    private BackgroundWorker backgroundAdvancedViewWorker = new BackgroundWorker();
    private delegate void ShowViewDelegate();

    public void Run()
    {
        MainGeneralReportForm mainForm = ObjectFactory.GetOrCreateView<IMainGeneralReportForm>();
        backgroundSimpleViewWorker.RunWorkerAsync(_mainForm);
        GeneralReportFormatView formatView =
                        ObjectFactory.ShowView<IGeneralReportFormatView>()
        resetEvent.WaitOne();
        DoSomething(advancedSearchView);
    }

    private void backgroundAdvancedViewWorker_DoWork(object sender, DoWorkEventArgs e)
    {
        MainGeneralReportForm mainForm = e.Argument as MainGeneralReportForm;

        if (mainForm!= null && mainForm.InvokeRequired)
        {
            mainForm.BeginInvoke(new ShowViewDelegate(() =>
            {
              advancedSearchView =
                    ObjectFactory.ShowView<IGeneralReportAdvancedSearchView>();                  
              resetEvent.Set();
             }));
            }
        }
    }

If main thread doesn't wait for second thread, the application throws NullReferenceException. Is exist any solution or workaround of this problem?