Thumbnails (value of view)
Thumbnails view displays the records for an entity using an image property as a thumbnail.
Make sure you set the displayproperties for the listing using the three levels, that is: displaypropreties="PRIMARY_PROPERTIES;SECONDARY_PROPERTIES;THIRD_PROPERTIES". The display primary properties are shown as the main text under the thumbnail. The display secondary properties are shown when the mouse goes over an item. The tertiary property specifies an image to be used for the thumbnail.