[CONNECT] Detect Associative Region Element

I'm attempting to measure the area of shapes in a DGN model.  If my model scanner finds a shape or complex shape then the measurement is straightforward.

Some things that look like shapes are associative regions.  They seem to be a cell named AssociativeRegion containing a single shape element. I can write a class to analyse that object, but am I missing something in the API?  Is that a sufficient and consistent construction of an associative region?  I can see a C++ handler for associative regions (AssocRegionCellHeaderHandler), but I don't see its analog for .NET.