Chromecast

As you know I got myself a chromecast just a couple of weeks ago. It works rather well and it seems to do the job. One thing I have yet to work how to do is to set it running on say u tube the use my iPad for something else while it plays out on the TV. So far every time I have tried this as soon as I start to try and do something else the video stops. From reading on Google's website on chromecast that is not what is supposed to happen.

So I don't know doing a search has not given me a solution.