iPad and airport express

I have two airport express that I use primarily for playing itunes in different rooms.
I can control which rooms from my iPad with the icon ( blue square with triangle )... Until I yesterday I could do the same with any sound ie tv on he iPad but the icon has now disappeared after I re configured airport express.

Can someone help me get the icon back as its great for watching sport etc in a room with no tv

What did you do to reconfigure? It is pretty much plug and play - if your express is on the same network as your ipad it should just show up as you saw.