This new version of the assembly interface extends
IAssembly.
Developers are encouraged to use this version of the assembly
interface.
Client code can query an INode for this interface:
INode* n;
IAssembly2* a = GetAssemblyInterface2(n);
These methods should be called on assembly heads only. Calling them
on members will not affect the display of the bounding box. The
bounding box is displayed in red (by default) around an open
assembly. Turning it off can reduce viewport clutter; it won't
affect the functionality of the assembly (the way the assembly
works).
Calling these methods on an assembly head, affects the display of
the bounding box only on that assembly.