Example setup for Membus to dispatch messages of a certain kind onto the UI thread...

UiMessages.cs

// Use like BusSetup.StartWith<Conservative>().Apply<UiMessages>().Construct();

internal class UiMessages : ISetup<IConfigurableBus>
{
    void ISetup<IConfigurableBus>.Accept(IConfigurableBus setup)
    {
        setup.ConfigurePublishing(obj => 
        {
            obj.MessageMatch(mi => mi.IsType<IUIMsg>()).PublishPipeline(new UiMsgDispatcher());
        });
    }

    private class UiMsgDispatcher : IPublishPipelineMember
    {
        private readonly SequentialPublisher _seq = new SequentialPublisher();

        public void LookAt(PublishToken token)
        {
            Dispatcher.CurrentDispatcher.EnsureActionOnDispatcher(() => _seq.LookAt(token));
        }
    }
}