Public Event MouseWheel As MouseWheelEventHandler

Dim instance As UXFlowItem
Dim handler As MouseWheelEventHandler
 
AddHandler instance.MouseWheel, handler

public event MouseWheelEventHandler MouseWheel

public event MouseWheel: MouseWheelEventHandler; 

In JScript, you can handle the events defined by another class, but you cannot define your own.

public: __event MouseWheelEventHandler* MouseWheel

public:
event MouseWheelEventHandler^ MouseWheel