Thread tr0 = new Thread(new ParameterizedThreadStart((obj1) =>            {                lock (aaa)                {                    Thread.Sleep(3000);                    this.Dispatcher.Invoke(new Action(() =>                    {                        Thread.Sleep(3000);                    }));                }            }));            tr0.IsBackground = true;            tr0.Start();            Thread.Sleep(3000);            lock (aaa)            {                Thread.Sleep(3000);            }