@Override
    public View getHeaderView(int position, View convertView, ViewGroup parent) {
        return mDelegate.getHeaderView(mHeaders[position].getRefPosition(), convertView, parent);
    }
Adapter wrapper to insert extra views and otherwise hack around GridView to
add sections and headers.

@author Tonic Artos
Library/src/com/tonicartos/widget/stickygridheaders/StickyGridHeadersSimpleAdapterWrapper.java