@Override
    public boolean isEnabled(int position) {
        Position adapterPosition = translatePosition(position);
        if (adapterPosition.mPosition == POSITION_FILLER
                || adapterPosition.mPosition == POSITION_HEADER) {
            return false;
        }

        return mDelegate.isEnabled(adapterPosition.mPosition);
    }
@return the adapter wrapped by this adapter.
Library/src/com/tonicartos/widget/stickygridheaders/StickyGridHeadersBaseAdapterWrapper.java