'Declaration
Public Event BeforeRotation As GdViewer.BeforeRotationEventHandler
public event GdViewer.BeforeRotationEventHandler BeforeRotation
public event BeforeRotation: GdViewer.BeforeRotationEventHandler;
In JScript, you can handle the events defined by another class, but you cannot define your own.
public: __event GdViewer.BeforeRotationEventHandler* BeforeRotation
public: event GdViewer.BeforeRotationEventHandler^ BeforeRotation