// Render a header for each column
for (int i = 0; i < columns_.size(); i++)
{
ObjectGridColumn col = columns_.get(i);
TableCellBuilder cell = row.startTH();
cell.className(style_.objectGridHeader());
Cell.Context context = new Cell.Context(0, i, null);
renderSortableHeader(cell, context, col.getHeader(),
i == host_.getSortColumn(),
host_.getAscendingSort());
cell.endTH();