/*virtual*/ BOOL CPreferencesDlg::CreateClient() {
   if (!__super::CreateClient())
      return(FALSE);
 
   for (INT_PTR i = 0; i < m_arrButtons.GetSize(); ++i) {
      CButton * const pButton = m_arrButtons.GetAt(i);
      CString strButton;
      pButton->GetWindowText(strButton);
      const DWORD nID = ::GetWindowLong(pButton->GetSafeHwnd(), GWL_ID);
      
 
      CButton * const pXTPButton = new CXTPButton();
      
      if (!pXTPButton->Create(strButton, pButton->GetStyle(), CRect(0, 0, 0, 0), this, nID))
      {
         delete pXTPButton;
         continue;
      }
 
      delete pButton;
      m_arrButtons.SetAt(i, pXTPButton);
 
      pXTPButton->SendMessage(WM_SETFONT, (WPARAM)(HFONT)m_fntNormal, FALSE);
   }
 
   SendMessageToDescendants(WM_XTP_SETCONTROLTHEME, xtpControlThemeResource, 0);
   
   RecalcLayout();
 
   return(TRUE);
}

Please make some virtual methods so I can sabstitute CXTPButton.