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