Silverlight VB AddHandler To Dynamic Object?

We are migrating an application from C# to VB to meet our project's needs but stumbled upon a problem with event handling in VB.

The application uses a COM Wrapper access a scanner in Silverlight. The object is created dynamically in the code, and an event is added to "AcquirePage". This requires elevated trust of course.

Code in C#:

dynamic TwainSession;
(...)
TwainSession.AcquirePage += new AcquirePageDelegate(AcquirePageEventHandler);

As the only real "equivalent" of dynamic in VB is Object, we use:

Private TwainSession As Object

Everything is fine up to the point we want to handle an event of this Object. Because we are in Silverlight, we cannot have knowledge of the Object's structure or events, hence the need to create it dynamically. In C# we simply use "+=" to add a handler to an event but:

AddHandler TwainSession.AcquirePage, AddressOf AcquirePageEventHandler

In VB gives: 'AcquirePage' is not an event of 'Object'