@Override
  public boolean onListChildClick(
      ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {
    ClassicSector sector = mCard.getSector(groupPosition);
    ClassicBlock block = sector.getBlock(childPosition);

    String data = Utils.getHexString(block.getData(), "");

    String sectorTitle = getString(R.string.sector_title_format, sector.getIndex());
    String blockTitle = getString(R.string.block_title_format, block.getIndex());
    new AlertDialog.Builder(getActivity())
        .setTitle(String.format("%s, %s", sectorTitle, blockTitle))
        .setPositiveButton(android.R.string.ok, null)
        .setMessage(data)
        .show();

    return true;
  }