I would like to share with you a small custom score & timer title i´m using for my soccer games.
It consists in 2 VS2013 projects, one is the title itself and the other is the controller.

The title DLL starts a small http server that listen to commands sent by the controller, the title starts a thread in the background that sets/runs the clock from the time you send the command from the controller.

The controller also lets you hide part of the title.

You can see it working here: Custom XAML DLL Demo

And you can Download it from here VMIX Timer & Score

Please notice that if you add the title you will need to stop vmix from task manager as i havent found a way to stop the background thread.
Hope it helps

I Forgot to mention that VMIX has to be run as administrator, you have to check if port 8080 is listening after you add the DLL Title or you can test the http server on http://localhost:8080/ to see if server is available, be sure that you don´t have another server listening on that port.