Returns the elements observed by the add-on.
    GSErrCode  ACAPI_Element_GetObservedElements (
        GS::Array<API_Elem_Head>*     elemHeads
    );
    
Parameters
- elemHeads  
- [out] The headers of the observed elements.
Return Values
- NoError
- The function has completed with success.
For other common API errors see the API Errors document.
Requirements
- Version: API 4.1 or later
- Header: ACAPinc.h