You can populate Unified Modeling Language (UML) sequence
diagrams with C/C++ elements to understand interactions in existing
C/C++ applications.
You must be in the C/C++ perspective
and have a sequence diagram open.
To populate a UML sequence diagram with C/C++ elements,
in the C++ Projects view, right-click a C/C++
class or data type, or selected C/C++ classes and data types; then
click .