Public Delegate Sub PropertyChangingEventHandler(Of T)( _
   ByVal sender As Object, _
   ByVal e As PropertyChangingEventArgs(Of T) _
) 

Dim instance As New PropertyChangingEventHandler(Of T)(AddressOf HandlerMethod)

public delegate void PropertyChangingEventHandler<T>( 
   object sender,
   PropertyChangingEventArgs<T> e
)

public delegate PropertyChangingEventHandler( 
    sender: TObject;
    e: PropertyChangingEventArgs
);

JScript does not support Generics.

public: __gc __delegate void PropertyChangingEventHandler<T>( 
   Object* sender,
   PropertyChangingEventArgs<T*>* e
)

generic<typename T>
public delegate void PropertyChangingEventHandler( 
   Object^ sender,
   PropertyChangingEventArgs<T^>^ e
)