Attributes on bodies

Hi All,

I am working on SolidWorks addin using C#.

In my app the copy of SW bodies are used. When the SW bodies gets changedthen my copied bodies need to identify the changes and match. So trying to add

the same attribute on SW body as well as extension copied bodies. But facing issue when the SW bodies gets changed like apply fillets or extrude with merge then the

attributes are getting vanished. I tried tracking ID's as well but it is giving same behavior.

please help. Thanks in advance.

SolidworksApi/macros