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

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

function get_CanSetCustomViewRotationUsingContextMenu() : boolean;

True - panel should show a context menu that allows to set custom image rotation; False - panel should not show a context menu that allows to set custom image rotation. Default value is False.