Annotation GetExtension throwing exception

[User (Legacy)]

I am trying to create a chart with an annotation toolbar dynamically.  I use 

the following code: 

  try 

  { 

   pAnnList = chartfx->GetExtension("AnnotationX.AnnList"); 

  } 

  catch(...) 

  { 

   pAnnList.CreateInstance(__uuidof(AnnotationX)); 

   HRESULT rs = chartfx->AddExtension((IUnknown *)pAnnList); 

  } 

Everytime that I call a chart that does not have an annotation object, it 

wil throw a C++ Exception.  The Try Catch seems to handle it, but I was 

wondering if this exception was normal for a GetExtension call? 

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Josh Eanes