private FillerView getFillerView(View convertView, ViewGroup parent, View lastViewSeen) {
        FillerView fillerView = (FillerView)convertView;
        if (fillerView == null) {
            fillerView = new FillerView(mContext);
        }

        fillerView.setMeasureTarget(lastViewSeen);

        return fillerView;
    }
@return the adapter wrapped by this adapter.
Library/src/com/tonicartos/widget/stickygridheaders/StickyGridHeadersBaseAdapterWrapper.java