{ 
  "table":"all_controls",
  "layout":"grid",
  "caption": "Image Listing",
  "fields": [
    {"name":"x_primary", "type":"int", "key":1},
    {"name":"x_image_with_thumbnails","control":"image","type":"file","caption":"Image",
      "controlparams": { "data_folder": "tutorials_all_controls" },
      "controlstyle": "max-width: 200px; max-height: 100px;"
    },
    {"control":"image","type":"file","caption":"Thumbnail",
      "controlparams": {
        "data_folder": "tutorials_all_controls",
        "data_file_prefix": "x_image_with_thumbnails",
        "show_thumbnail": "small"
      }
    }
  ]
}