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

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

function get_CreateCollectionHeaderContentCallback() : Function;

A function, which returns UI elements for the header of marks collection in redaction marks list panel, OR "null".
Here is function prototype "function __createMarksCollectionHeaderContent(markCollection, index)", where "markCollection" parameter is an instance of WebPdfRedactionMarkCollectionJS type, index - zero-based index of redaction marks collection.
Important: "__createMarksCollectionHeaderContent" function must return not empty array of WebUiElementJS objects.