/* 해당경우에는 Fragment 가 정상적으로 출력 됩니다.*/
	FragmentTransaction ft = fragmentManager.beginTransaction();
        if ( currentFragment != null )
        {
        	ft.remove(currentFragment);
        }
	makeFragment(cls);
	ft.add(fragmentId, currentFragment);
        ft.commit();

하지만 이 경우에는 java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first. 를 뱉어냅니다.

 
FragmentTransaction ft = fragmentManager.beginTransaction();
        navigationStack.pop();
        ft.remove(currentFragment);
//        ft.commit();
//        ft = fragmentManager.beginTransaction();
        Fragment prev = navigationStack.peek().fragment;        
        ft.add(fragmentId, prev);
        ft.commit();

Stack을 이용해서 다중적인 Tab관리를 위해서 만들었는데 잘 안되네요 ㅠㅠ

이부분 해결할 방법 없을까요??