{ 
  "table":"all_controls",
  "layout":"form",
  "onecolumn":true,
  "caption": "File Download",
  "fields": [
    {"name":"x_primary", "type":"int", "key":1},
    {"name":"x_file","type":"file","control":"file_download","controlparams": { "data_folder": "tutorials_all_controls" },"caption":"x_file"},
    {"control": "label", "value":"Download", "link": "download:FieldFile_Download_Form&x_file","caption":"Download Link"}
  ]
}