dockstation alarm problems

I've recebtly purchased the philips as141. Everything works fine but for one thing. I installed the dockstatiin app, and the alarm works. But for some reason I cannot select any music to play, only the standard sounds.
I wor with a sony xperia T wit my music both on the internal memory as on a memory card.
Any help?

So when you go into dockstudio,clock,alarm settings,select alarm 1,sound, music library and here select your song...

Do you have the option to get into music library and select the music there or do you not see this?