@Override
protected void addAncillaryColumns( ColumnPicker<InboxPageRow> columnPicker,
SortableHeaderGroup<InboxPageRow> sortableHeaderGroup ) {
Column<InboxPageRow, ComparableImageResource> formatColumn = new Column<InboxPageRow, ComparableImageResource>( new ComparableImageResourceCell() ) {
public ComparableImageResource getValue( InboxPageRow row ) {
//TODO: get icons for different asset format
//AssetEditorFactory factory = clientFactory.getAssetEditorFactory();
//return new ComparableImageResource( row.getFormat(), factory.getAssetEditorIcon( row.getFormat() ) );