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