[HELP] How to Transpa Notification Header (Gt-I9060I)(KK)

hi guys.
i'm new here and hope my post wont be ignored.
i just need to know how to transpa the notif header.
the one with the red box on the image.
i already tried changing background to #00000000 at status_bar_expanded_header.xml (line 2)
i already tried changing it to png also.
and i already tried making the default background which is located at colors.xml to transpa.
but nothing happens..stays the same after all i did.
please help me guys.
thanks in advance to those who will help.
best regards :)[IMG] free photo hosting[/IMG]