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//Instead of

viewPager.setAdapter(new SimpleFragmentStatePagerAdapter(getFragmentManager(),mParentString));

//do

viewPager.setAdapter(new SimpleFragmentStatePagerAdapter(getChildFragmentManager(),mParentString));

popBackStack()
popBackStack("A")

Call popBackStack("A" POP_BACK_STACK_INCLUSIVE);
onBackStackChangeListner();

manager.addOnBackStackChangeListner(this);

getBackStackEntryCount()

getBackStackEntryAt(int index)