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/// 
    /// Designates a Windows Presentation Foundation application model with added functionalities.    /// 
     public class UIHelper : CLeopardTestWPF    {        private static DispatcherOperationCallback exitFrameCallback = new DispatcherOperationCallback(ExitFrame);        /// 
        /// Processes all UI messages currently in the message queue.        /// 
        public static void DoEvents()        {            // Create new nested message pump.            DispatcherFrame nestedFrame = new DispatcherFrame();            // Dispatch a callback to the current message queue, when getting called,             // this callback will end the nested message loop.            // note that the priority of this callback should be lower than the that of UI event messages.            DispatcherOperation exitOperation = Dispatcher.CurrentDispatcher.BeginInvoke(                DispatcherPriority.Background, exitFrameCallback, nestedFrame);            // pump the nested message loop, the nested message loop will             // immediately process the messages left inside the message queue.            Dispatcher.PushFrame(nestedFrame);            // If the "exitFrame" callback doesn't get finished, Abort it.            if (exitOperation.Status != DispatcherOperationStatus.Completed)            {                exitOperation.Abort();            }        }        private static Object ExitFrame(Object state)        {            DispatcherFrame frame = state as DispatcherFrame;            // Exit the nested message loop.            if (frame != null)            {                frame.Continue = false;            }            return null;        }    }

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