Nested reflection

I'm trying to set a value that's nested within another class. There are a lot of levels, which are starting to confuse me, and I need a second (or third) opinion.

The two named classes at the bottom are third party classes from Ivi.Visa.Interop.dll (a VISA communication library). I do not have access to their source code.

Visually, it looks like this:

Parent (A)

temp = new B();
temp.session = new FormattedIO488();
temp.session.IO = ...
temp.session.IO.TerminationCharacterEnabled = ...

Subclass (B) : Parent (A)

...
public dynamic session
...

FormattedIO488: IFormattedIO488

...
IMessage IO { get; set; }
...

IMessage: IBaseMessage

...
    [DispId(1610743814)]
    bool TerminationCharacterEnabled { get; set; }
...

The problem: I want to set TerminationCharacterEnabled, but during Runtime, the system can't find the property. It can find FormattedIO488.IO, but it can't find any sub-properties.

I have observed that IO is null after creating a new FormattedIO488, but I can't create a new instance of the abstract class IMessage.

I do not have the issue when I do something like this:

FormattedIO488 temp = new FormattedIO488()
temp.IO = ...
temp.IO.TerminationCharacterEnabled = ...

I've scoured the internet and StackOverflow, trying a bunch of different solutions to get something, but so far I haven't found a solution. Any help or tips would be highly appreciated.