重写控件样式

public class FrameCheckBox : CheckBox
    { 

        public FrameCheckBox()
            : base()
        {
            var uri = new Uri("pack://application:,,,/WpfApp2;component/Theme/CheckBox.xaml");
            ResourceDictionary res = new ResourceDictionary { Source = uri };
            Application.Current.Resources.MergedDictionaries.Add(res);

            this.Style = (Style) Application.Current.Resources["DefaultCheckBoxStyle"]; 
        }

        protected override void OnToggle()
        {
            base.OnToggle();
            UIhelp.DoEvents();
            

        }
}

public class UIhelp
    {
        public static void DoEvents()
        {
            try
            {
                var nestedFrame = new DispatcherFrame();
                var exitOperation = Dispatcher.CurrentDispatcher.BeginInvoke(
                    DispatcherPriority.Background, new DispatcherOperationCallback(state =>
                    {
                        var frame = state as DispatcherFrame;

                        if (frame != null)
                        {
                            frame.Continue = false;
                        }
                        return null;
                    }), nestedFrame);
                Dispatcher.PushFrame(nestedFrame);
                if (exitOperation.Status != DispatcherOperationStatus.Completed)
                {
                    exitOperation.Abort();
                }

            }
            catch (Exception e)
            {
                
               Console.WriteLine(e.StackTrace);
            }
           
        } 
        
    }