sprockets/src/main/java/net/sf/sprockets/app/ui/PanesActivity.java
@Nullable
    @SuppressWarnings("unchecked")
    public <T extends Fragment> T findFragmentByPane(@IntRange(from = 1, to = 2) int pane) {
        String tag = Elements.get(sPanes, pane - 1);
        return tag != null ? (T) getFragmentManager().findFragmentByTag(tag) : null;
    }
@Nullable
    @SuppressWarnings("unchecked")
    public <T extends Fragment> T findFragmentByPane(@IntRange(from = 1, to = 2) int pane) {
        String tag = Elements.get(sPanes, pane - 1);
        return tag != null ? (T) getFragmentManager().findFragmentByTag(tag) : null;
    }
Get the fragment that is displayed in the pane.

@return null if a fragment hasn't been added to the pane yet