how to indicate childs counts in the group field?

void CXTPListCtrlEx::Populate()
{
 CXTPReportControl::Populate();
 EditItem(NULL);
 BeginUpdate();
 CString strCaption;
 CXTPReportGroupRow* pGroup = NULL;
 CXTPReportRow* pRow = NULL;
 
 for (int nPlainRow = 0; nPlainRow < m_pPlainTree->GetCount(); nPlainRow++)
 {
  pRow = m_pPlainTree->GetAt(nPlainRow);
  if(pRow->IsGroupRow()) {
   strCaption.Format(_T("(%d)"), pRow->GetChilds()->GetCount());
   pGroup = (CXTPReportGroupRow*)pRow;
   strCaption = pGroup->GetCaption() + strCaption;
   pGroup->SetCaption(strCaption);
  }
  pRow->InternalAddRef();
 }
 EndUpdate();
}