[CONNECT U15 VB] Application Events OnDesignFileOpened and OnDesignFileClosed cannont be found

I am upgrading a program from V8i to CONNECT Update 15.  The V8i code had an instance of the Application class declared as follows:

Private WithEvents msApp As Bentley.Interop.MicroStationDGN.Application = Nothing

And thencode to handle the OnDesignFileOpened event:

Public Sub DesignFileOpened(ByVal Filename As String) Handles msApp.OnDesignFileOpened

This works in v8i.  In CONNECT I get the following error:

Error    BC30590    Event 'OnDesignFileOpened' cannot be found.

Can someone tell me how to upgrade this or what I am doing wrong?