var instance = new Vintasoft.Imaging.UI.UIElements.WebImageViewerContextMenuJS(imageViewer, settings);

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

function get_CanSetCustomViewRotation() : boolean;

True - context menu should contain items, which allow to rotate image view; False - context menu should not contain items, which allow to rotate image view. Default value is False.