Windows Phone music player app plays songs from phone library - windows-phone-8

Im learning windows phone 8 development recently. And started developing music player that plays from phone library. I used MediaLibrary API to get all songs,albums and its working fine now.
What is the problme now is i've assigned MediaPlayer_MediaStateChanged,and MediaPlayer_ActiveSongChanged to mediaplayer object. It triggers when i change the songs that are displayed in longListSelector. That events are not firing when i press next or prev button that i get when I press volume button.
Hope You understood what is the problem.
I tried using backgroundPlayerAgent and got to know that doesn support MediaLibrary.
And I saw this question also. But i saw few apps that are able to listen to those prev/next button events. If you know what am i missing please help?? Is there any other third party libraries available?? I've searched lot in web but i dint get any usefull information. SO posting this question thinking that i might get some information

Go to Settings > Music
Search for Filter audio files
set audio files By Size....
You will get all songs then

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Sorry bout that!