var instance = new Vintasoft.Imaging.Annotation.UI.WebAnnotatedThumbnailViewerJS(controlId);

var value; // Type: boolean
value = instance.get_LoadAnnotationsOnlyForVisibleThumbnails();

function get_LoadAnnotationsOnlyForVisibleThumbnails() : boolean;

True - viewer must load annotation collections only for visible thumbnails; False - viewer must load annotation collections only for all thumbnails. Default value is True.