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

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

function get_CreatePageFieldsHeaderContentCallback() : Function;

A function, which returns UI elements for the header of page interactive fields collection, OR "null".
Here is function prototype "function __createPageFieldsHeaderCallback(image, index)", where "image" parameter is an instance of WebImageJS type, index - zero-based index of image in image collection. Important: "__createPageFieldsHeaderCallback" function must return not empty array of WebUiElementJS objects.