added custom column identifier to listbox config

data/invoices_01.json

@@ -17,7 +17,7 @@
         {"type":"a", "direct":{"href":"", "className":"action"}, "attributes":{"data-i18n":"", "data-action":"last", "data-icon":"step-forward", "data-iconpos":"notext"}, "logic":{"text": "Last"}}]}
     ],
     "controlbar": [
-      {"global_search": true, "element": {"type": "input", "direct":{"id":"global_search_invoices"},"attributes":{"data-enhanced":"true", "data-i18n": "","placeholder":"Search Invoices", "data-icon":"search", "data-action-btn":"true", "data-type":"search", "type":"search"},"logic":{"clear":"true", "action":"search"}}, "children":[]},
+      {"global_search": true, "element": {"type": "input", "direct":{"id":"global_search_invoices", "className": ""},"attributes":{"data-action":"search", "data-enhanced":"true", "data-i18n": "","placeholder":"Search Invoices", "data-icon":"search", "data-action-btn":"true", "data-type":"search", "type":"search"},"logic":{"clear":"true", "action":"search"}}, "children":[]},
       {"record_info": true,  "element": {"type": "div", "direct": {"className":"info"}, "attributes": {"data-info":"records"}}, "children":[]},
       {"select_info": true,  "element": {"type": "div", "direct": {"className":"info"}, "attributes": {"data-info":"selected"}}, "children":[]},
       {"filter_info": true,  "element": {"type": "div", "direct": {"className":"info"}, "attributes": {"data-info":"filter"}}, "children":[]}
@@ -38,7 +38,7 @@
       {"title": "total_price", "show": true, "persist": true, "sort":true},
       {"title": "price_currency", "show": true, "priority": 4, "sort":true, "merge": "total_price", "merge_title": null },
       {"title": "translated_simulation_state_title", "show": true, "priority": 6, "sort":true  },
-      {"title": "download", "show": true, "persist": true, "actions": ["download"], "sort": false}
+      {"title": "download", "show": true, "persist": true, "actions": ["download"], "sort": false, "custom": true}
     ]
   },
   "actions": []