Why I can't add a instance of Fragment?

This can be a problem:

add(int title, java.lang.Class<? extends android.support.v4.app.Fragment> clazz)

I need to have a:

add(int title, Fragment fragment)

Why, If I need create a instance of the Fragment, I need use this.

[ogaclejapan]

Please try checked Don’t keep activities in the developer mode. When you view again after returning to the home, it will change to a different instance. Often occurs is similar events in low memory device.

    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        Object item = super.instantiateItem(container, position);
        Log.d("DEBUG", "position: " + position + " " + item.toString());
        if (item instanceof Fragment) {
            mHolder.put(position, new WeakReference<Fragment>((Fragment) item));
        }
        return item;
    }

[ppamorim]

Solved!