SaveState saves only positon og Tabs. Where is no way for CXTPTabClientWnd  to save/restore actual window childs.

You must manually save childs and reopen in startup, CXTPTabClientWnd  will automatically create tabs for them.

Hint code:

void CMainFrame::OnClose()
{

  CWnd* pMDIClient = CWnd::FromHandle(m_hWndMDIClient);
  CChildFrame* pWnd = (CChildFrame*) pMDIClient->GetDlgItem(nIndex);

  while (pWnd)
  {
   CStylerView* pView = (CStylerView*)pWnd->GetActiveView();
   ASSERT(pView);   

   if (pView) strPopups += pView->GetDocument()->GetCurrentUrl() + ";";
   
   pWnd = (CChildFrame*) pMDIClient->GetDlgItem(++nIndex);
  }
  
  AfxGetApp()->WriteProfileString(_T("MainFrame "), _T("LastVisited"), strPopups);
  
 }

 CMDIFrameWnd::OnClose();
}

void CMainFrame::OpenLastVisited()
{
 CString strBuffer = AfxGetApp()->GetProfileString(_T("MainFrame"), _T("LastVisited"));
 
 if (!strBuffer.IsEmpty())
 {
  LPTSTR pBuffer = strBuffer.GetBuffer(0);
  
  TCHAR* token = _tcstok(pBuffer, _T(";"));  
  while (token)
  {
   OpenWindow(token);
   token = _tcstok( NULL, _T(";"));
  }  
 } 
}