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

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

function get_CanMoveThumbnail() : boolean;

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