I have an assembly with many sub-assemblies.  I have been able to get the Mass Properties of every sub-assembly and part withing the master assembly.  I use the ModelDocExtension interface to do this which has the IncludeMassPropertiesOfHiddenBodies flag to set, and it works.  I am able to compute mass properties without including Hidden Bodies.   Now I am trying to take two or more random components (parts or subassemblies or mixed) and find their mass properties using a MassProperty interface.  Whenever I do this, I always get the mass of the hidden bodies included.  How can I prevent the Hidden Bodies from being included?  I am trying to have the functionality of the Mass Property Dialog Box where I can add as many parts/assemblies I want to.

Thank you.