MaskEdit with ComboBox

How can I use the MaskEdit Control with a CComboBox ?

Regards

1. Derive a new class from CComboBox f.ex.

2. Add Member :
CXTDateEdit m_MaskedEdit;

3. Overwrite PreSubclassWindow() :

void CUIDateCtrl::PreSubclassWindow()
{
  if(GetDlgItem(1001))
  {    
   CString sDefault = COleDateTime::GetCurrentTime().Format(FMT_DATE);
   m_MaskedEdit.SubclassWindow( ((CXTDateEdit *) GetDlgItem(1001))->m_hWnd );
   
   m_MaskedEdit.SetEditMask(FMT_DATE_MASK, FMT_DATE_LITERAL, sDefault);
  }
  else
  {
      ASSERT(FALSE); // combobox has wrong style
  }
 
 CComboBox::PreSubclassWindow();
}