Hi Andries, Thank you for this great widget! I use it for every datagrid I implement. I 'm trying to set the background color for a table row when an boolean attribute in the row is true. So I set the grid entity the same as the entity of the above datagrid and select my boolean attribute. In the Class Mapping I set the key to true and I set the CSS Class. <tr class="mx-name-index-1" data-id="291" tabindex="1"><td data-id="292" class="mx-name-column4 mx-right-aligned" title="1001"> Now I can't find the CSS class on the row when I try to find it in the browser through 'inspect element'. Do I do something wrong? Or is Mendix version 5.13.1 not supported? Thank in advance Gerard