var instance = new Vintasoft.Imaging.Pdf.UI.Panels.WebUiPdfInteractiveFormFieldsPanelJS(settings, stateButton);

var value; // Type: function
value = instance.get_CreateInteractionFieldContentCallback();

function get_CreateInteractionFieldContentCallback() : Function;

A function, which returns UI elements for the interaction field list record, OR "null".
Here is function prototype "function __createFieldContent(field)", where "field" parameter is an instance of WebPdfInteractiveFormFieldJS type. Important: "__createFieldContent" function must return not empty array of WebUiElementJS objects.