var instance = new Vintasoft.Imaging.UI.UIElements.WebThumbnailViewerContextMenuJS(thumbnailViewer, settings);

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

function get_CanDeleteThumbnails() : boolean;

True - context menu should contain items, which allow to delete thumbnails; False - context menu should not contain items, which allow to delete thumbnails. Default value is False.