Public Event OverflowItemChanging As EventHandler(Of OverflowItemChangingEventArgs)

Dim instance As UXOverflowStackPanel
Dim handler As EventHandler(Of OverflowItemChangingEventArgs)
 
AddHandler instance.OverflowItemChanging, handler

public event EventHandler<OverflowItemChangingEventArgs> OverflowItemChanging

public event OverflowItemChanging: EventHandler; 

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

public: __event EventHandler<OverflowItemChangingEventArgs*>* OverflowItemChanging

public:
event EventHandler<OverflowItemChangingEventArgs^>^ OverflowItemChanging