OLE Automation with Threads

My main thread calls this function when a menu is clicked on..Notice the last function call it a start of a thread.
The next section of code is the thread code...
void CYAGMeasurementSystemProjectDoc::OnBegintest()
{
      // TODO: Add your command handler code here
      if (!theMeasurementSession.GetOutputFileName())
            return;
      if (!theMeasurementSession.Verify())
            return;
      FrequencySetter.Initialize(&theMeasurementSession, &theJAG, &MeasurementTaker);
      MeasurementTaker.Initialize(&theJAG, &theMeasurementSession, &DataRecorder);
      DataRecorder.Initialize(&theMeasurementSession, FrequencySetter.NumberOfFrequencyPoints());
      MeasurementThreadHandle = AfxBeginThread(CMeasurementThread, nothing);
}


UINT CMeasurementThread ( LPVOID param )
{
      //const COleVariant vOpt((long)DISP_E_PARAMNOTFOUND, VT_ERROR);
      
      if (!AfxOleInit())
      {
            AfxMessageBox(IDP_OLE_INIT_FAILED);
            return FALSE;
      }

      POSITION DocTemplatePosition = AfxGetApp()->GetFirstDocTemplatePosition();
      CSingleDocTemplate* m_pDocTemplate = (CSingleDocTemplate *) AfxGetApp()->GetNextDocTemplate(DocTemplatePosition);
      POSITION DocPosition = (*m_pDocTemplate).GetFirstDocPosition();
      CYAGMeasurementSystemProjectDoc* Doc = (CYAGMeasurementSystemProjectDoc *)(*m_pDocTemplate).GetNextDoc(DocPosition);
(*Doc).BeginMeasurements();      
}

Here is the BeginMeasurments code that is called
void CYAGMeasurementSystemProjectDoc::BeginMeasurements()
{
      FrequencySetter.BeginMeasurements();
}

This is the same Frequency Setter Objec that is Initialized before the Thread is called.  This FrequencySetter Object is a private data memeber of the CYAGMeasurementSystemProjectDoc class.  This FrequencySetter Object also has a pointer to the DataRecorder, which is also a private member of the CYAGMeasurementSystemProjectDoc class.  Notice in the new thread, the function BeginMeasurements is called.  This function accesses the DataRecorder which accesses an Excel _Application object..but it will not access the object from within the new thread.  All this code will work if I Initialize the DataRecorder (which contains the Excel Application) in the same thread that I access it from, but i can't do that?..
If there are any questions, please ask. thanks