Axc>A3:OnSetFocus(CWnd* pOldWnd)
Axc>{
Axc>  A3Parent::OnSetFocus(pOldWnd);
  a1->>SendMessage(WM_A3SETFOCUS);
Axc>}

Axc>A1:OnA3SetFocus(UINT wParam, LONG lParam)
Axc>{
Axc>  SetFocus(a2->m_hWnd);
Axc>}
Axc>