onLoadFinished not called on offscreen fragment until going back

onLoadFinished not called on offscreen fragment until going back

I'm trying to implement List->Detail scheme with details pagination.
I've single Activity for ListView and different Activity with ViewPager.
In FragmentStatePagerAdapter.getItem i instatniate new fragment for page
and pass item id via setArguments Bundle.
After opening pager Activity two Fragment pages are created and onCreate,
onCreateView, onActivityCreated being called.
BUT
onLoadFinished is called only for first Fragment (currently visible). If i
go back onLoadFinished is called for second Fragment.
Strage thing is that when i swipe to second (onLoadFinished for third not
called), back to first and again go forward to second OnLoadFinished is
called for third fragment and every next - after going back and forward
always next fragment is being fully created in advance.
Is this bug or feature? How fully loading can be forced?