How to create a thumbnail search result page?

Hello,

I want to create a customized thumbnail serch result page and I tried to do it as it is explain in the doc :

Thumbnail View Tables

The table for the Thumbnail View is created differently. The ColumnProperties or RowData result sets are not constructed. Instead, the number of columns are set and an IdocScript include name is used to "paint" each cell. This is less easy to customize and less data-driven than the other methods, but this type of table is also much less structured.�

<$numDamColumns = 4$>
<$damCellIncludeName = "my_sample_dam_cell"$>
<$include dam_table_header$>
<$loop SearchResults$>
  <$include dam_table_item$>
<$endloop$>
<$include dam_table_footer$>