Compound Note
A compound note is a note that can contain multiple text strings and
sketch geometry.
Compound notes are equivalent to a user-defined symbol and can be created
using IDrawingDoc::CreateCompoundNote.
Once created, you can use the other compound note methods to add text
and sketch geometry to the object.
This object appears to the end-user as though it were one item. If the
user selects the compound note and drags it, all of the entities and text
move together.